Definition
A Latin phrase meaning "for the time being." In legal and governmental contexts, pro tempore describes an officer, judge, or official who serves temporarily in place of the regular holder of a position — either because the permanent officer is absent, the position is vacant, or a specific session or proceeding requires a substitute. The appointment or designation is inherently provisional: authority exists only for the duration specified, and the pro tempore officer does not permanently displace the regular officeholder.
In legislative bodies, pro tempore most commonly designates a presiding officer who acts in the absence of the permanent presiding officer. In courts, a judge pro tempore is one appointed to hear a specific case or serve during a defined period, typically under statutory authority. In corporate and organizational governance, an officer may act pro tempore pending a formal election or appointment.
Common Language
Modern common usage (Wiktionary): "temporarily; for the time being"
Historical common usage (Webster's 1913): Not independently defined; the phrase was treated as self-evidently Latin and in common educated use.
The common and legal meanings are essentially aligned — both signal temporary, provisional status. The legal significance lies not in a semantic gap but in the formal structure that attaches to the designation: pro tempore status is a recognized legal appointment with defined authority, not merely informal substitution. Calling someone a "temporary" officer in ordinary speech implies informality; designating someone pro tempore in a legal or governmental context triggers specific rules about scope of authority, duration, and recordkeeping.
Common Confusion
Pro tempore is sometimes used interchangeably with acting, interim, and ad interim, but these are not identical. An acting officer typically steps into a role by operation of law or administrative order when a permanent officer is unavailable, often without a separate appointment process. An interim officer is appointed to fill a vacancy until a permanent successor is chosen. Pro tempore emphasizes the time-limited, provisional nature of the authority — often tied to a specific session, proceeding, or occasion — rather than to a vacancy per se. Courts and legislative rules frequently define these designations separately, and conflating them in historical research can produce errors about the legal basis and scope of an officer's authority.
Why It Matters in Research
Researchers encounter pro tempore most frequently in three contexts: legislative records, court records, and corporate or organizational documents.
In legislative records, the President pro tempore of the U.S. Senate is a constitutionally recognized position with a continuous line of succession significance, not merely a procedural convenience. State legislative equivalents vary considerably in authority and duration. When reading historical session records, distinguish between a formally designated president pro tempore who served an entire session and a member who merely presided over a single day's sitting — both may appear under the same label.
In court records, judge pro tempore designations are creatures of statute in most jurisdictions. The authority of a pro tempore judge to hear particular matters, issue rulings, or sign orders may be limited by the terms of appointment. Historical cases decided by judges pro tempore sometimes generated appeals challenging the validity of the appointment itself, making the procedural posture important to verify.
In corporate and organizational records — particularly probate, trust, and partnership documents in 19th- and early 20th-century sources — pro tempore appears frequently to describe trustees, administrators, or officers acting pending formal appointment. The scope of their legal authority in those interim acts can be disputed, and researchers should not assume pro tempore authority was plenary.
Bouvier's entry is notable mainly for what it does not provide: the phrase receives a three-word gloss before Bouvier moves immediately to adjacent Latin terms, suggesting the phrase was considered self-evident rather than legally complex in 19th-century practice. This underrepresentation in historical dictionaries means researchers relying solely on period sources may underestimate the procedural significance attached to pro tempore designations in specific institutional contexts.
Historical Dictionary Support
All three historical sources treat pro tempore as a Latin phrase requiring translation rather than legal analysis. Black's (both editions) offers "for the time being; temporarily; provisionally" — a straightforward rendering with no elaboration on institutional usage. Bouvier provides the same compressed gloss before pivoting to unrelated Latin terms.
The uniformity across sources reflects the period assumption that the phrase was transparent to any trained lawyer and required no further exposition. What is missing from all three is any treatment of the structural legal questions the designation raises: the source of pro tempore authority, its limits, the effect of acts performed under pro tempore status, and the procedural requirements for valid designation. Researchers should treat the historical dictionary entries as confirming translation only, not as guidance on the legal implications of pro tempore appointments in specific institutional settings.
Jurisdictional Note
Pro tempore designations in courts are governed by state statute in most U.S. jurisdictions, and the permissible scope of a pro tempore judge's authority — including whether consent of the parties is required — varies significantly. Federal legislative usage is constitutionally anchored; state legislative equivalents are governed by individual state constitutions and chamber rules. Researchers should not assume uniform authority from the phrase alone.