This federal criminal law glossary defines, in plain English, the terms most commonly used in federal criminal cases. Federal criminal law has its own vocabulary, and unfamiliar terms can make an already stressful situation harder to navigate.
The definitions below are arranged A to Z and cover charges and procedure, sentencing, appeals, and post-conviction relief. They are general federal criminal law definitions, not legal advice, and the precise meaning of any term can depend on the facts of a particular case. These plain-English entries work alongside the full guides in our resource library.
If a term here connects to a question about your own situation, we are glad to help. Our firm offers a paid, one-hour initial consultation to review a federal matter with an attorney.
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Terms A–C
Acceptance of Responsibility. A reduction in the offense level under the Sentencing Guidelines for a defendant who clearly demonstrates that he accepts responsibility for the offense, most often by pleading guilty. It typically lowers the advisory range by two or three levels.
Acquittal. A finding by a judge or jury that the government has not proven a defendant guilty beyond a reasonable doubt. An acquittal ends the prosecution on that charge and, under the Double Jeopardy Clause, generally cannot be appealed by the government.
Allocution. The defendant’s opportunity to speak directly to the court before the sentence is imposed. Allocution allows defendants to express remorse, explain the circumstances, and address the judge personally.
Appeal. A request that a higher court review the proceedings of a lower court for legal error. A federal criminal appeal reviews the trial record; it is not a new trial and does not reweigh the evidence.
Arraignment. An early court hearing at which a defendant is formally advised of the charges, informed of certain rights, and asked to enter a plea of guilty or not guilty.
Bail Reform Act. The federal statute that governs whether a defendant is released or detained before trial. It directs the court to consider whether any conditions of release can reasonably assure the defendant’s appearance and the safety of the community.
Booker (United States v. Booker). The 2005 Supreme Court decision held that the United States Sentencing Guidelines are advisory rather than mandatory. After Booker, a judge must calculate and consider the Guidelines range but may sentence above or below it.
Brady Material. Evidence favorable to the defendant that the prosecution must disclose. Under Brady v. Maryland, suppressing evidence material to guilt or punishment violates due process, regardless of whether the prosecutor acted in good faith.
Burden of Proof. The obligation to prove a fact in court. In a criminal case, the burden rests entirely on the government, which must prove every element of the offense beyond a reasonable doubt.
Career Offender. A Sentencing Guidelines designation that sharply increases the advisory range for a defendant with two or more qualifying prior felony convictions for crimes of violence or controlled-substance offenses, where the current offense is also such a crime.
Compassionate Release. A reduction of a federal sentence under 18 U.S.C. Section 3582(c)(1)(A) when extraordinary and compelling reasons justify it and the sentencing factors support it. Common grounds include serious illness, advanced age, and certain family circumstances.
Concurrent and Consecutive Sentences. When a defendant is sentenced on more than one count, concurrent sentences are served at the same time, while consecutive sentences are served one after another. The choice can dramatically affect total time in custody.
Conspiracy. An agreement between two or more people to commit a federal crime. Conspiracy is itself a separate offense, and a defendant can be convicted of conspiracy even if the underlying crime was never completed.
Criminal History Category. One of six categories under the Sentencing Guidelines, determined by a defendant’s prior convictions and related history. Together with the offense level, it sets the advisory sentencing range.
Terms D–G
Departure. A sentence above or below the Guidelines range that is based on a specific provision within the Guidelines themselves, as distinct from a variance, which rests on the broader statutory sentencing factors.
Detention Hearing. A hearing at which a federal court decides whether a defendant will be held in custody or released pending trial. The defense can present a release plan, proposed conditions, and supporting witnesses.
Discovery. The process by which the prosecution and defense exchange information before trial, including documents, recordings, and other evidence. Court rules, statutes, and constitutional disclosure obligations govern federal discovery.
Downward Variance. A sentence below the advisory Guidelines range, granted after the court weighs the statutory sentencing factors in 18 U.S.C. Section 3553(a). It is a central goal of sentencing mitigation.
Element of an Offense. One of the specific components of a crime that the government must prove beyond a reasonable doubt to obtain a conviction. If the proof fails on any single element, the charge fails.
First Step Act. A 2018 federal law that, among other reforms, expanded sentencing relief, modified certain mandatory minimums, broadened the safety valve, and changed how compassionate release motions may be brought.
Forfeiture. A legal process by which the government seeks to take property connected to a crime, such as the proceeds of fraud or assets used to commit an offense. Forfeiture can be part of a criminal sentence.
Good Conduct Time. Credit that reduces the time a federal inmate actually serves, currently up to fifty-four days per year, awarded for satisfactory institutional conduct. It is the main way a federal sentence is shortened, since parole no longer exists.
Grand Jury. A group of citizens that hears evidence presented by federal prosecutors and decides whether there is probable cause to charge a person with a crime. Grand jury proceedings are secret, and the defense is not present.
Guilty Plea. A defendant’s formal admission of guilt that resolves a case without a trial. A federal guilty plea must be knowing and voluntary, and the court must follow the procedures in Rule 11 before accepting it.
Terms H–O
Habeas Corpus. A legal proceeding by which a person in custody challenges the lawfulness of that detention. In the federal system, post-conviction challenges most often proceed under 28 U.S.C. Section 2255 or, in some circumstances, Section 2241.
Indictment. The formal charging document returned by a grand jury. Under the Fifth Amendment, a person generally cannot be tried for a serious federal crime without an indictment, though a defendant may waive that right.
Ineffective Assistance of Counsel. A claim that a lawyer’s representation fell short of the Sixth Amendment. Under Strickland v. Washington, a defendant must show both deficient performance and prejudice — a reasonable probability that the outcome would have been different.
Information. A charging document filed by a prosecutor rather than returned by a grand jury. A felony is usually charged by information only when the defendant waives the right to a grand jury indictment, often as part of a plea.
Loss Amount. The dollar figure used in fraud and other financial cases to set the offense level under the Sentencing Guidelines. Because larger losses sharply raise the advisory range, the loss calculation is often heavily contested.
Magistrate Judge. A federal judicial officer who handles many early-stage matters, such as initial appearances, detention hearings, search warrants, and certain pretrial proceedings, under the supervision of district judges.
Mandatory Minimum. A sentence floor set by statute that a judge generally cannot go below, regardless of the advisory Guidelines. Limited exceptions include the safety valve and a government motion based on substantial assistance.
Mens Rea. The mental state the government must prove for a given crime, such as acting knowingly, willfully, or with intent to defraud. Many federal defenses focus on whether the required mental state can be proven.
Mitigation. Evidence and argument presented to persuade the court to impose a lower sentence. Sentencing mitigation can address a defendant’s background, health, family, conduct, and the broader circumstances of the offense.
Motion to Suppress. A request asking the court to bar the government from using evidence obtained in violation of the Constitution, such as an unlawful search or a statement taken in violation of Miranda. A successful motion can reshape a case.
Notice of Appeal. The document that begins an appeal. In federal criminal cases, it must generally be filed within 14 days after entry of the judgment — a short, strictly enforced deadline.
Obstruction of Justice. A category of federal offenses involving interference with an investigation or proceeding. Obstruction can also be a sentencing enhancement that raises the offense level under the Guidelines.
Terms P–R
Plea Agreement. A negotiated contract between the defendant and the government that resolves a case. It may address the charges, sentencing recommendations, and the waiver of certain rights, and the court must approve it.
Preponderance of the Evidence. The standard of proof meaning more likely than not. While guilt at trial requires proof beyond a reasonable doubt, many sentencing facts are decided under this lower preponderance standard.
Presentence Investigation Report. A detailed report prepared by the U.S. Probation Office after a conviction. The PSR calculates the advisory Guidelines range and summarizes the offense and the defendant’s history; both sides may object to it before sentencing.
Pretrial Services. The federal office that investigates a defendant’s background before the initial appearance recommends release conditions to the court and supervises defendants who are released pending trial.
Probable Cause. A reasonable basis to believe that a crime has been committed or that specific evidence will be found. Probable cause is required to make an arrest, obtain most search warrants, and return an indictment.
Proffer. A meeting in which a person provides information to prosecutors, usually under a limited written agreement that restricts how the statements may be used. Proffers carry real risk and should be approached only with counsel.
Pro Hac Vice. Latin for “for this occasion.” It is the procedure by which a lawyer not generally admitted in a particular court is permitted to appear there for a specific case, typically alongside locally admitted counsel.
Relevant Conduct. Conduct beyond the offense of conviction that the Sentencing Guidelines may still count when calculating the advisory range, including certain uncharged acts. It can expand sentencing exposure significantly.
Restitution. A court order requiring a defendant to compensate victims for losses caused by the offense. In many federal cases, particularly fraud cases, restitution is mandatory.
Rule 11. The Federal Rule of Criminal Procedure that governs guilty pleas. It requires the court to ensure that a plea is voluntary, that the defendant understands the rights being given up, and that there is a factual basis for the plea.
Rule 35. The Federal Rule of Criminal Procedure that allows a sentence to be corrected or, on a government motion, reduced — most commonly to reward substantial assistance the defendant provided after sentencing.
Terms S–Z
Safety Valve. A statutory provision that allows a court to sentence certain defendants below an applicable mandatory minimum, primarily in drug cases, when they have a limited criminal history and meet the other statutory requirements.
Sentencing Guidelines. The framework issued by the United States Sentencing Commission producing an advisory sentencing range based on offense level and criminal history category. Since Booker, courts must consider but are not bound by the Guidelines.
Statute of Limitations. The deadline by which the government must bring charges. For most non-capital federal offenses, the limitations period is five years, though some offenses carry longer limitations periods or, in narrow categories, none.
Substantial Assistance. Help a defendant provides to the government, such as cooperation or testimony. On a government motion, substantial assistance can support a sentence below the Guidelines range or even below a mandatory minimum.
Superseding Indictment. A new indictment that replaces an earlier one, often to add charges or defendants or to refine the allegations as an investigation develops.
Supervised Release. A period of court-ordered supervision in the community that follows a term of federal imprisonment. Violating its conditions can lead to additional time in custody.
Target Letter. A written notice from a U.S. Attorney’s Office informing a person that he is a target of a grand jury investigation. It signals serious exposure but is not itself a charge.
United States Attorney. The chief federal prosecutor for a judicial district, who is appointed to lead that district’s U.S. Attorney’s Office. Assistant U.S. Attorneys handle the day-to-day prosecution of federal cases.
United States Sentencing Commission. The federal agency that creates and amends the Sentencing Guidelines and studies federal sentencing practice. Its work shapes the advisory ranges used in every federal sentencing.
Variance. A sentence above or below the Guidelines range based on the statutory sentencing factors in 18 U.S.C. Section 3553(a), as distinct from a departure, which is grounded in the Guidelines themselves.
Venue. The location where a case may properly be tried. In a federal criminal case, venue generally lies in the district where the charged offense was committed.
Writ of Certiorari. A request asking the United States Supreme Court to review a lower court’s decision. The Court grants certiorari in only a small fraction of cases, and a denial leaves the lower decision in place.
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