Definition
A condition is a qualification, provision, or contingency attached to a legal obligation, right, estate, or agreement that either triggers or defeats the legal effect of that instrument upon the occurrence or non-occurrence of an uncertain future event.
The term carries distinct meanings depending on legal context:
1. CONTRACT LAW. A condition is an event or state of affairs, not certain to occur, upon which the existence or continued enforceability of a contractual duty depends. A condition precedent must occur before a party's duty to perform arises. A condition subsequent operates to extinguish a duty or right already in existence if the specified event occurs (or fails to occur). The distinction matters acutely for who bears the burden of pleading and proof.
2. PROPERTY LAW. A condition annexed to a conveyance or devise by which an estate may commence, be enlarged, or be defeated upon the happening of a specified event. A fee simple subject to a condition subsequent, for instance, does not automatically terminate upon breach — the grantor must re-enter or bring an action, which distinguishes it from a fee simple determinable (which terminates automatically by limitation). Confusing these two forms has significant practical consequences.
3. CIVIL LAW TRADITION. In Roman and civilian legal thought, a condition is an agreement or paction regulating what the contracting parties intend should occur if a foreseen contingency comes to pass. Conditions were classified as casual (depending on chance), potestative (depending on the will of one of the parties), or mixed (depending partly on chance and partly on the will of a party). Louisiana's Civil Code preserves this tripartite taxonomy.
4. CRIMINAL LAW / PROBATION & BAIL. A term or requirement imposed by a court as part of a conditional release — whether on bail, probation, or supervised release. Violation of a condition may result in revocation of the release or imposition of a suspended sentence.
5. STATUS (historical). In the civil law and early common law, "condition" also referred to a person's rank or station in society — a usage that has almost entirely disappeared from modern legal writing but appears frequently in older sources.
Common Language
Modern common usage (Wiktionary): To subject to conditions or limitations; to make contingent upon; to shape behavior through repeated exposure; to treat or prepare something (as with hair conditioner). As a noun, a state or circumstance of being.
Historical common usage (Webster's 1913): Mode or state of being with regard to external circumstances, health, or strength; predicament; rank; position; estate.
The common usage of "condition" as a general state of affairs (the condition of the property; the patient's condition) is far broader and more passive than the legal meaning. In law, a condition is a precise operative event with specific procedural consequences — it controls when duties arise or terminate, and it allocates burdens of proof. A researcher encountering "condition" in a legal instrument should not assume it is merely descriptive language; it is a term of art with formal doctrinal weight.
Common Confusion
CONDITION vs. WARRANTY (CONTRACT): In contract law, a condition is a contingency that goes to the root of the obligation — its breach discharges the non-breaching party from performance. A warranty is a lesser term whose breach gives rise to damages but does not excuse non-performance. Early English cases and some historical American authorities used "warranty" and "condition" interchangeably in sale-of-goods contexts, generating significant confusion that persists in older secondary sources.
CONDITION SUBSEQUENT vs. LIMITATION (PROPERTY): A condition subsequent in property law requires an affirmative act by the grantor to enforce the forfeiture; a limitation (as in a fee simple determinable) causes automatic termination without re-entry. The language used in historical conveyances is frequently ambiguous, and courts have not always applied a consistent rule for resolving the ambiguity. Older cases and treatises sometimes use the terms interchangeably.
CONDITION PRECEDENT vs. CONDITION SUBSEQUENT (CONTRACT): The same terminology applies in contract law but with different analytical content than in property law. This parallel usage across two bodies of law — with related but non-identical doctrinal rules — is a persistent source of confusion in research and judicial opinions.
Recognized Forms
/SUBTYPES
— Condition Precedent: An event that must occur before a duty to perform arises.
— Condition Subsequent: An event whose occurrence extinguishes an existing duty or right.
— Concurrent Condition: Mutual conditions precedent where each party's performance is conditioned on the other's simultaneous tender.
— Casual Condition (civil law): Depends entirely on chance, outside either party's control.
— Potestative Condition (civil law): Depends on the will of one of the contracting parties; a purely potestative condition imposed by a debtor may be void in civilian jurisdictions.
— Mixed Condition (civil law): Depends partly on chance and partly on one party's will.
— Express Condition: Explicitly stated in the instrument.
— Implied Condition: Supplied by law or inference from the nature of the agreement.
— Condition in Law: An implied condition attached by operation of law rather than party agreement, distinguished in older authorities from "conditions in deed" (express).
— Illegal/Impossible Condition: A condition that is unlawful or physically impossible; effect on the underlying obligation varies between legal traditions (common law generally voids only the condition; civil law may void the entire obligation).
Why It Matters in Research
Researchers face several navigational hazards with this term.
First, the temporal layering of meanings. The status meaning of "condition" (a person's rank or social order) saturates pre-19th century sources. When Bouvier and early American courts invoke "condition," they may be referring to the standing of a party, not to a contingency clause. Read historical sources carefully for context before assuming the modern contractual or property meaning applies.
Second, the condition/limitation confusion in property sources. A large portion of historical real property litigation turns on whether a grantor used a true condition subsequent or a limitation — but older conveyancers and even courts were imprecise. Bouvier himself flags that older writers used "condition" without careful discrimination to denote limitations. When researching historical land titles or reversionary interests, the specific language of the original instrument matters more than the label any court or commentator applied to it.
Third, the civilian/common law split. Louisiana cases, and any sources drawing on Roman or French law, classify conditions using the casual/potestative/mixed taxonomy, which does not map neatly onto the common law condition precedent/subsequent dichotomy. A researcher moving between common law states and Louisiana authority must account for this divergence.
Fourth, conditions in criminal and administrative law. The word "condition" in bail, probation, parole, and regulatory contexts functions as a term of art for court-imposed requirements, and the corpus of relevant material is entirely separate from contract or property doctrine. A search for "condition" across an undifferentiated corpus will return material from multiple doctrinal silos — knowing which silo is relevant to the research problem is essential before beginning.
Fifth, the condition/warranty distinction in sale-of-goods law. English cases prior to the Sale of Goods Act 1893 and early American commercial decisions frequently blur this line. If dating a source and understanding its precise holding about breach and discharge, verify which term of art was actually operative in the court's analysis.
Historical Dictionary Support
The major historical dictionaries agree on the core definition — a condition is an uncertain future event annexed to a legal transaction that affects the parties' rights and duties — but differ in emphasis and taxonomy.
Black's (1st Ed.) leads with the civil law definition, citing Mackeldey's Roman Law, and presents the casual/potestative/mixed classification before addressing common law property conditions. This ordering reflects the period's scholarly engagement with civilian sources and may mislead researchers who expect common law doctrine to be primary.
Bouvier's is the most detailed and most cautious. He separately addresses the civil law status meaning, the contractual meaning, and the property meaning, and he explicitly warns that older writers used "condition" and "limitation" without careful discrimination — an editorial judgment that remains accurate and useful today. Bouvier also distinguishes "conditions in fact" (express) from "conditions in law" (implied), a distinction that shapes how courts allocated burdens of proof in 19th-century pleading.
Rapalje & Lawrence and Anderson track Black's general framework without adding significant independent analysis. Burrill's is more expansive on the historical English property cases but does not engage with the civilian taxonomy.
What the historical dictionaries largely miss is the modern contract law treatment of conditions as distinct from promissory duties — a distinction that became doctrinally central in 20th-century American contract law and is not fully anticipated in 19th-century sources. A researcher relying solely on Bouvier or Black's for contract condition doctrine will find the framework incomplete.
Jurisdictional Note
Louisiana follows the civil law taxonomy of casual, potestative, and mixed conditions, codified in the Louisiana Civil Code. A purely potestative condition that makes an obligation depend solely on the debtor's will may render the obligation null. Common law jurisdictions do not as a rule void obligations on this basis. Researchers working across Louisiana and other American jurisdictions should not assume civilian condition doctrine applies outside Louisiana.
Encyclopedia Cross-Reference
The Law Mind Criminal Law Encyclopedia: Probation — Conditions, Revocation, and Procedure
The Law Mind Criminal Law Encyclopedia: Bail and Bond — Types, Determination, and Conditions
The Law Mind Real Estate Transactions & Construction Encyclopedia: Differing Site Conditions — Type I (Misrepresentation) and Type II (Unusual Conditions)