Definition
To proffer is to offer something — evidence, testimony, an agreement, or a legal document — for acceptance by another party or by a court. The term functions as both a verb (to proffer) and a noun (a proffer).
In legal practice, proffer carries distinct meanings depending on context:
1. Evidence law. A proffer is a formal offer of evidence made to a court, typically to preserve the record when evidence has been excluded or is anticipated to be excluded. The offering party states what the excluded evidence would show, enabling appellate review of the ruling. Sometimes called an "offer of proof."
2. Criminal procedure — proffer agreement. A proffer agreement (also "proffer letter" or "queen for a day" agreement) is a written arrangement between a criminal defendant (usually through counsel) and a prosecutor, under which the defendant provides information or testimony to the government in exchange for limited-use protections. The government typically agrees not to use the defendant's proffer statements directly in its case-in-chief, though the agreements frequently preserve use for impeachment and derivative use.
3. General litigation. More broadly, any formal presentation or tender of something to a court or opposing party — a proffer of documents, a proffer of stipulated facts, a proffer of a witness's anticipated testimony.
Common Language
Modern common usage (Wiktionary): "An offer made; something proposed for acceptance by another; a tender." Also: "An attempt, an essay."
Historical common usage (Webster's 1913): "To offer for acceptance; to propose to give; to make a tender of; as, to proffer a gift; to proffer services; to proffer friendship."
The common meaning maps onto the legal meaning closely in its surface sense — both involve offering something to another. The meaningful gap is in the legal specificity: in litigation, a proffer is not a casual offer but a structured, procedurally significant act with consequences for the record and, in the criminal context, for a defendant's rights. A proffer agreement in particular carries enforceable terms that have nothing to do with the word's ordinary usage.
Common Confusion
PROFFER vs. OFFER OF PROOF: These terms are used interchangeably in many jurisdictions, but some courts and practitioners draw a distinction. An offer of proof is the evidentiary procedure under Federal Rule of Evidence 103(b) by which a party preserves error after exclusion of evidence; proffer is sometimes used more broadly to include any pre-admission presentation of evidence for the court's consideration. In historical sources, "proffer" also overlaps with PROFERT (the formal production of a document in common law pleading) and TENDER (an offer to perform or pay). Anderson's cross-references to both, signaling that historical usage was not clean.
Why It Matters in Research
The word proffer is a research trap precisely because it looks like ordinary English. Researchers scanning historical sources may underestimate that its legal meaning has sharpened considerably, particularly with the rise of the modern proffer agreement as a criminal defense tool — a practice that has no historical common law equivalent and emerged from twentieth-century federal prosecutorial practice.
In the Law Mind corpus, proffer appears in at least three distinct legal neighborhoods: evidence doctrine (offers of proof, preservation of error), criminal procedure (cooperation agreements, Fifth Amendment implications of proffer statements), and historical common law pleading (profert, production of documents). Sources from different eras may use the word in any of these senses without flagging which they mean.
For researchers working on criminal procedure materials: proffer agreements are creatures of contract as well as procedure, and courts have litigated extensively what happens when the government or defendant deviates from the agreement's terms. The document is both a procedural tool and a private contract — a dual character that affects how courts analyze disputes over its enforcement.
Anderson's entry routes the researcher to PROFERT, PROPOUND, and TENDER — useful signposts that in nineteenth-century legal usage, proffer sat within a cluster of terms about formal presentation and delivery, not primarily about cooperation with prosecutors.
Historical Dictionary Support
Anderson's Dictionary of Law does not provide a standalone definition of PROFFER, instead cross-referencing PROFERT, PROPOUND, and TENDER. This is instructive: in the period Anderson's covers, the legally operative concept was more likely to be framed as a profert (the formal pleading act of producing a document) or tender (a formal offer of performance). "Proffer" as a freestanding legal term of art had not yet fully differentiated itself.
Anderson's entry on PROFIT appears to have been inadvertently included in the source material and has no bearing on PROFFER.
Webster's 1913 confirms that the word's common meaning — to offer, to tender — was well established, but treats it as ordinary English rather than technical vocabulary. The legal sharpening of the term into a procedural mechanism, particularly in criminal procedure, is a twentieth-century development that historical dictionaries do not capture.
Jurisdictional Note
Proffer agreements are most extensively developed in federal criminal practice; state practice varies considerably in whether and how such agreements are used. The evidentiary proffer (offer of proof) is codified in federal practice under FRE 103 and has state analogs, but procedural requirements differ by jurisdiction.