Definition
To apply, in legal usage, carries two distinct and frequently encountered meanings:
1. To make a formal request or petition — usually in writing — to a court, administrative officer, board, or other authority, seeking the granting of some relief, order, rule, or favor within that body's power or discretion. Examples include applying for an injunction, a pardon, a license, a writ, or a policy of insurance. In this sense, "apply" describes the act of initiating a formal proceeding or request.
2. To use, employ, or appropriate something for a particular purpose. In this sense, a trustee applies funds to the benefit of a beneficiary; a court applies a legal standard to the facts of a case; a statute applies to a defined class of persons or conduct. This second meaning is pervasive in legal reasoning — it describes how rules, doctrines, funds, or remedies are brought to bear on specific circumstances.
A third, derivative usage appears in constitutional and statutory law: whether a law or constitutional provision applies to a given person, situation, or set of facts. This usage underlies the distinction between facial and as-applied challenges to legislation.
Common Language
Modern common usage (Wiktionary): To lay or place one thing against another; to put to use for a particular purpose; to submit oneself as a candidate; to address oneself to a task or authority; to work diligently.
Historical common usage (Webster's 1913): To lay or place (one thing to another); to put to use or employ for a particular purpose; to make use of or declare as suitable or relevant; to devote to a particular end; to address oneself or refer.
The common and legal meanings are closely related, but the legal context sharpens and formalizes both senses. In law, "apply for" carries procedural weight — it is the act that triggers jurisdiction, starts a clock, or creates a record. And "apply a rule" is not merely descriptive usage; it is the central cognitive act of legal reasoning, connecting abstract doctrine to specific facts. The gap between casual and legal usage is narrower here than with many terms, but the procedural significance of the first sense and the analytical significance of the second are distinctly legal in character.
Common Confusion
The two meanings of "apply" operate in entirely different registers and are sometimes conflated in historical sources and older pleading practice. When a party "applies to the court," they are making a request (sense 1). When a court "applies the statute," it is exercising interpretive judgment about scope and relevance (sense 2). Confusing these senses can produce misreading of historical case records — a document that describes a party "applying the funds" is not a petition; a document describing "applying to the chancellor" is not a description of appropriation.
The third usage — whether a law applies to a given situation — is related to sense 2 but has acquired independent constitutional significance. See the as-applied challenge discussion below.
Why It Matters in Research
Researchers working in the Law Mind corpus will encounter "apply" in at least three analytically distinct contexts, and the correct reading depends heavily on context:
Procedural filings and petitions: In older equity practice, the motion or application was often the primary vehicle for seeking court relief. The word "apply" in a historical equity record typically signals a formal petition to the chancellor or court, not merely an informal request. Researchers tracing the origins of modern motion practice should treat historical "applications" as functionally equivalent to modern motions.
Statutory and common law interpretation: The question of whether a statute or rule "applies" to a given party or conduct is central to virtually every area of substantive law. In historical sources, this analysis often appeared without the modern vocabulary of "scope," "coverage," or "applicability" — courts simply reasoned about whether a rule did or did not "apply." Recognizing this usage is essential for understanding the development of interpretive doctrine.
Constitutional litigation — as-applied challenges: The distinction between facial and as-applied challenges to statutes turns entirely on the second legal meaning of "apply." An as-applied challenge concedes that a statute may be valid in other contexts but argues that its application to this particular party or set of facts is unconstitutional. This is one of the most consequential analytical distinctions in modern constitutional litigation, and it is invisible to researchers who treat "apply" as a purely ordinary-language term. See the Encyclopedia cross-reference below.
Corpus navigation note: Because "apply" is one of the most common verbs in legal writing generally, full-text searches will return enormous and undifferentiated results. Researchers should combine "apply" with limiting terms — "as applied," "apply to the court," "apply the funds," "apply the standard" — to retrieve contextually meaningful results.
Historical Dictionary Support
Black's Law Dictionary (1st and 2nd editions) agree closely on both senses, presenting them in identical order: formal petition first, appropriation or use second. Neither edition develops the third sense — whether a rule applies to a given situation — as a distinct definition, though that usage pervades the case law both editions cite throughout. This is a meaningful gap: the modern constitutional significance of "application" versus "facial" validity was not yet systematized when these editions were compiled, and researchers should not expect historical dictionaries to flag it.
Both editions use the same illustrative examples (injunction, pardon, insurance policy), which reflects the dominance of equity and chancery practice in the period. The petition sense of "apply" was the workhorse of equity pleading; its migration into common law practice is traceable through court records across the nineteenth century.
Neither edition addresses the now-standard administrative law usage — applying for a license, permit, benefit, or government approval — which became central as the administrative state expanded in the twentieth century. Researchers working in administrative law materials should not expect historical dictionary support for this usage and should consult secondary sources.
Encyclopedia Cross-Reference
Facial Challenges vs. As-Applied Challenges — The Law Mind Constitutional Law Encyclopedia (constitutional_11): Essential reading for any researcher working with the constitutional sense of "apply." The distinction between challenging a law on its face and challenging its application to specific facts is the primary doctrinal context in which the legal meaning of "apply" carries the most analytical weight.
Maritime Products Liability — Applying General Maritime Law to Defective Products — The Law Mind Military, Veterans & Admiralty Law Encyclopedia (military_47): Relevant for researchers working on choice-of-law and preemption questions in admiralty, where the question of which body of law "applies" to a given dispute is a threshold issue with significant substantive consequences.