Definition
A fact is something that occurred, exists, or is true in the world — as distinguished from a legal conclusion, opinion, or rule of law. In legal proceedings, facts are the raw material of adjudication: the events, conditions, and circumstances that courts and juries find to be true (or not), and to which rules of law are then applied.
The law treats "fact" as carrying distinct meanings depending on context:
1. Fact as opposed to law. This is the foundational distinction. Questions of fact concern what happened — did the defendant sign the document, was the road wet, did the parties intend to form a contract? Questions of law concern what legal rules apply and how they are to be interpreted. This division governs everything from the scope of appellate review (facts are reviewed deferentially; law is reviewed de novo) to the constitutional role of the jury.
2. Fact in the context of pleading and proof. A fact is an allegation capable of being proven true or false by evidence. Conclusions of law and mere legal labels are not facts for pleading purposes; only specific, concrete occurrences or conditions satisfy the requirement.
3. Adjudicative fact versus legislative fact. In modern evidence law, adjudicative facts are the particular facts of a specific dispute — who did what, when, to whom. Legislative facts are broader generalizations about the world that inform how a court interprets the law or frames policy. The distinction drives the operation of judicial notice rules.
4. Ultimate fact versus evidentiary fact. An ultimate fact is a fact that, once found, directly determines legal liability or a right — the finding that a party was negligent, for example. An evidentiary (or probative) fact is a subsidiary fact from which an ultimate fact may be inferred.
Common Language
Modern common usage (Wiktionary): A fact is something known to be true; a piece of information that has objective reality, as opposed to opinion or fiction.
Historical common usage (Webster's 1913): "A thing done or that comes to pass; an act; an event; a circumstance; a reality; as, history deals in facts." Webster's also noted the legal shade: "The assertion of a fact in a pleading, as distinguished from a conclusion of law."
The ordinary meaning of "fact" — something simply true — tracks the legal meaning in a general way, but the legal environment introduces technical consequences ordinary speakers never navigate. Lawyers and courts routinely deploy the fact/law distinction to control who decides what, and on what standard of review. The further division into adjudicative versus legislative facts, or ultimate versus evidentiary facts, has no counterpart in everyday speech and can be invisible to researchers encountering these terms in historical sources without a doctrinal frame.
Common Confusion
Fact versus conclusion of law. Courts and practitioners sometimes disagree about whether a given proposition is a fact or a legal conclusion. The line matters enormously: in pleading, a complaint that states only legal conclusions — not facts — fails to state a claim. On appeal, factual findings bind a reviewing court; legal conclusions do not. Historical treatises and opinions often draw the line differently than modern doctrine, and researchers should not assume consistency across eras.
Fact versus opinion. Witnesses ordinarily testify to facts, not opinions. But this distinction blurs when facts require interpretation or involve technical subjects, making lay opinion rules and expert opinion rules the practical resolution. The categories overlap and the line is procedurally managed rather than philosophically clean.
Core Elements
The fact/law distinction — the legal system's most consequential deployment of the word — rests on several operating principles:
— Allocation of decision-making authority. Facts are for the finder of fact (jury in jury trials; judge in bench trials). Law is for the judge. The Seventh Amendment preserves the right to jury trial on questions of fact in common law suits.
— Standard of review. Appellate courts review factual determinations under a deferential standard (clearly erroneous in federal civil practice; substantial evidence in administrative law). Legal conclusions are reviewed de novo.
— Judicial notice. Courts may take judicial notice of facts that are not reasonably subject to dispute — either because they are generally known or because they can be accurately determined from reliable sources. This mechanism bypasses the normal proof process.
— Pleading sufficiency. A complaint must allege sufficient facts, not mere legal conclusions, to state a cognizable claim. This principle has gained modern doctrinal significance and has historical antecedents in common law pleading requirements.
Why It Matters in Research
The word "fact" is so foundational that it appears in nearly every corner of the corpus, and its meaning shifts depending on the doctrinal context. Researchers should attend to several pressure points:
Historical sources use fact/law vocabulary inconsistently. What a nineteenth-century court called a "mixed question of fact and law" may not map cleanly onto the modern appellate review framework. Read historical usage of these terms skeptically and trace how the distinction was operationalized in the specific context being studied.
The adjudicative/legislative fact vocabulary is modern. Rapalje & Lawrence (1883) and similar historical dictionaries do not use this terminology; it was formalized in Kenneth Culp Davis's administrative law scholarship in the mid-twentieth century and codified in the Federal Rules of Evidence (Rule 201). When researching judicial notice in older sources, the underlying concept exists but the label does not.
Ultimate versus evidentiary fact is a line with real procedural stakes. In directed verdict practice, summary judgment, and sufficiency-of-evidence review, courts must identify whether a finding of the disputed fact would be outcome-determinative. Older equity practice used similar vocabulary in different procedural contexts.
Mistake of fact doctrine is a discrete body of criminal law with its own rules about which mistakes excuse, which reduce culpability, and which are irrelevant. Researchers entering the criminal corpus should consult Criminal 136 before relying on general definitions.
Expert opinion presents recurring fact-identification problems. Under Rule 703, an expert may base an opinion on otherwise inadmissible facts or data if the type is reasonably relied upon in the field. The question of what counts as the underlying "facts or data" is distinct from the question of what the expert's opinion concludes. CivPro 172 develops this in detail.
Historical Dictionary Support
Rapalje & Lawrence define "fact" in terms that reflect the dominant preoccupation of nineteenth-century practice: the distinction between fact and law as the organizing principle of pleading and the division of labor between judge and jury. Their entry treats the fact/law distinction as foundational and largely self-evident — a reflection of how thoroughly it was embedded in common law procedure by the time of writing.
What historical dictionaries of this period uniformly miss: the adjudicative/legislative fact distinction; any sustained treatment of judicial notice as a rule of evidence rather than an exercise of judicial discretion; and the modern pleading-sufficiency doctrine that turns on the difference between facts and conclusions. These gaps are not failures of the historical sources — the doctrinal apparatus did not yet exist — but they are traps for researchers who assume historical definitions carry modern technical weight.
Rapalje & Lawrence also use "fact" in the older sense now largely confined to criminal law: "after the fact" (as in accessory after the fact) refers to an act committed following a completed crime. This usage survives in modern law but is archaic in general speech and can create confusion when encountered outside its criminal law context.
Jurisdictional Note
The fact/law distinction and its procedural consequences are substantially uniform in American federal courts. State court practice varies at the margins, particularly in how mixed questions of fact and law are resolved on appeal and how state administrative law handles legislative facts. Researchers working in specific state systems should verify whether the state has adopted the Federal Rules of Evidence or operates under distinct judicial notice standards.
Encyclopedia Cross-Reference
Mistake of Fact — Criminal 136
Judicial Notice of Adjudicative Facts — Rule 201 — CivPro 205
Bases of Expert Opinion — Rule 703 (Facts or Data Not Admissible) — CivPro 172