Definition
Prolongation is the extension of a time period fixed for the performance of a contractual obligation. In legal usage, the term refers specifically to a formal grant of additional time to a party bound by a contract or agreement — most commonly a debtor obligated to repay a debt or a contracting party obligated to perform by a set date. The term appears in two primary legal contexts:
1. Surety law. A prolongation of time granted by a creditor to a principal debtor — without the surety's consent — discharges the surety. The logic is that the surety agreed to guarantee performance within a defined window; altering that window alters the risk the surety accepted.
2. Construction and commercial contracts. Prolongation refers to an extension of the contract period, typically arising from employer-caused delays. A contractor may be entitled to a "prolongation claim" — compensation for time-related costs incurred because the project extended beyond its original completion date.
Common Language
Modern common usage (Wiktionary): The act of prolonging; that which has been prolonged; an extension.
Historical common usage (Webster's 1913): The act of lengthening in space or in time; extension; protraction. That which forms an additional length.
Editorial note: Common usage treats prolongation as a neutral, descriptive word for making something longer. Legal usage carries consequence: a prolongation of time is not merely descriptive but operative — it triggers specific legal effects, particularly the discharge of sureties who did not consent to the extension. Researchers encountering the word in historical legal texts should not read it as merely descriptive.
Core Elements
In surety law, the legal effect of prolongation depends on three conditions:
1. An existing obligation with a fixed time for performance.
2. A grant of additional time made by the creditor to the principal debtor.
3. The surety's lack of consent to that extension.
When all three conditions are present, the surety is discharged. If the surety consents, the discharge does not follow. This framework is the consistent teaching of Bouvier, Black's, and the underlying common law authorities.
Why It Matters in Research
Surety discharge is the primary legal effect attached to this term across all historical sources, and researchers working in 19th-century commercial or creditor-debtor materials will encounter it in exactly that context. The rule — prolongation without consent discharges the surety — is a standard common law principle that appears with little variation across English and American authorities of that era.
Two research traps are worth flagging:
First, the civil law rule ran opposite. Bouvier notes that under Roman civil law, prolongation of time to the principal did not discharge the surety — citing the Digest. Researchers working with civil law jurisdictions, Louisiana materials, or sources drawing on Roman law should not assume the common law discharge rule applies. The divergence between common law and civil law on this point is genuine and historically documented.
Second, the construction law context is largely absent from the historical dictionaries. "Prolongation claim" as a term of art in construction contract law is a modern development — one tied to delay damages doctrine, concurrent delay analysis, and standard-form contracts such as the JCT and FIDIC forms. Researchers working in construction law will find the historical dictionaries unhelpful on this usage and should look to modern treatises and industry contract commentary instead.
The term also connects to the related concept of "giving time" — treated as its own entry in Bouvier — which is the creditor's side of the same transaction. Researchers tracing how courts analyzed forbearance, indulgence, and extension agreements in 19th-century surety cases should index both terms.
Historical Dictionary Support
Black's (1st and 2nd editions) and Bouvier's are in close agreement on the core definition: prolongation is time added to the duration of something, specifically an extension of the time fixed for performance of an agreement. All three sources use nearly identical language and illustrate the definition with the same legal consequence — surety discharge.
Bouvier adds the most analytical depth by explicitly flagging the civil law divergence and cross-referencing the Digest. Black's entries are more compressed but consistent. Neither edition of Black's addresses the civil law counterpoint with the same care as Bouvier, which is a gap researchers should note when the civil law tradition is at issue.
All three sources are silent on prolongation in the construction contract sense. That usage postdates these dictionaries and belongs to a distinct doctrinal lineage.
Jurisdictional Note
The surety-discharge rule upon unconsented prolongation is a general common law principle recognized across U.S. and English courts. Louisiana, as a civil law jurisdiction, historically followed the Roman rule under which prolongation alone did not discharge the surety — a meaningful departure that affects how researchers should read Louisiana surety cases and civil law secondary sources.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia — Suretyship (for the discharge rule and the consent exception); Contract Performance and Breach (for time-of-performance obligations and extensions generally).