Definition
A Latin term from Roman civil law referring to a mutual cancellation or deduction of opposing debts — in effect, a set-off. In its primary procedural sense, compensatio describes a defendant's claim that an amount owed to him by the plaintiff should be deducted from, or extinguished against, the plaintiff's demand. The mechanism operates on the principle that when two parties are mutual debtors, their obligations can be balanced against each other rather than enforced separately in full.
The term carries a secondary, distinct meaning in matrimonial procedure:
1. COMPENSATIO (debt set-off): The civil law analog to the common law set-off. The defendant does not deny the plaintiff's claim but asserts a cross-debt sufficient to reduce or eliminate what would otherwise be owed. Described in the Digest as debiti et crediti inter se contributio — a mutual contribution of debt and credit.
2. COMPENSATIO CRIMINIS (set-off of fault): In divorce proceedings, a plea of recrimination. The respondent spouse, accused of matrimonial fault, answers by asserting that the petitioning spouse is equally or comparably at fault. The effect, where recognized, is to bar or diminish the petitioner's relief. Sometimes rendered in English as "compensation of crime" or "set-off of guilt," though neither phrase captures the procedural posture precisely.
Common Confusion
Compensatio is consistently glossed as equivalent to the common law set-off, but the equivalence is imprecise. Common law set-off developed as a statutory remedy (Statutes of Set-Off, 2 Geo. II c. 22 and 8 Geo. II c. 24) and operated within narrow procedural limits — typically requiring liquidated, presently due, cross-demands between the same parties in the same capacity. Roman compensatio, by contrast, operated in some forms by operation of law (ipso jure), extinguishing overlapping debts automatically upon concurrence rather than requiring a formal plea. Researchers treating the two as identical will misread civil law sources. Similarly, compensatio criminis should not be confused with condonation or connivance, which are distinct defenses in divorce proceedings with different elements and effects.
Why It Matters in Research
Researchers encounter compensatio in two distinct corridors of the Law Mind corpus, and the term's context determines which body of doctrine applies.
In civil law and mixed-jurisdiction materials — Louisiana, Quebec, Scots law, civilian-influenced treatises — compensatio appears as a live substantive doctrine rather than a historical curiosity. Sources from these traditions may discuss compensatio legalis (automatic extinction by operation of law) alongside judicial or voluntary forms, a taxonomy that common law set-off doctrine does not replicate. Reading civilian sources through a common law lens will produce misunderstanding of when and how the defense operates.
In English and American sources, compensatio functions primarily as learned Latin shorthand for set-off, borrowed to signal civilian pedigree or to add precision when discussing the historical roots of the remedy. Blackstone's reference at 3 Bl. Comm. 305 is the standard citation anchor in these materials and appears across the historical dictionaries consistently.
Compensatio criminis is the more practically consequential subterm for researchers working in family law history. It appears in nineteenth-century divorce treatises and case reporters as a recognized defense in fault-based divorce systems. Its viability collapsed as no-fault divorce spread through American jurisdictions after 1970, and it is largely obsolete in modern American practice — but researchers working with pre-reform materials will encounter it regularly. The phrase is sometimes abbreviated in older reports as "compensatio" alone, requiring context to distinguish the matrimonial plea from the debt-deduction mechanism.
The Digest citation (Dig. 16, 2) is a reliable anchor for tracing the Roman source. Burrill's additional reference to Kames' Equity (1 Kames' Equity, 395) signals that Scottish equity jurisprudence engaged with compensatio as a living doctrine, which may be useful for comparative research.
Historical Dictionary Support
The three source dictionaries agree substantially on the core definition and share the same foundational citations: Dig. 16, 2; Inst. 4, 6, 30, 39; and 3 Bl. Comm. 305. Burrill is the most expansive, adding the Codex reference (Cod. 4, 31), the Kames citation, and the Latin technical name from the Digest — debiti et crediti inter se contributio — which neither Black's edition reproduces. This phrase is genuinely useful, capturing the reciprocal structure of the doctrine more precisely than "set-off" does.
Black's 2nd Ed. extends the entry with a sub-entry for compensatio criminis that the 1st Ed. leaves incomplete in the available excerpt. Both Black's editions treat the term as historical rather than operative, reflecting the common law posture of received authority rather than civilian practice.
None of the dictionaries address the distinction between compensatio ipso jure and compensatio requiring a judicial act — a doctrinal fault line that matters considerably in civilian sources. Researchers should not assume the dictionaries' silence on this point means the distinction is unimportant; it is simply beyond the common law lexicographers' frame of reference.
Jurisdictional Note
In Louisiana and other civil law jurisdictions, compensation (the vernacular form of compensatio) remains a substantive doctrine governed by civilian rules, including automatic extinction of concurrent debts, and differs procedurally from common law set-off. Researchers should apply civilian authorities rather than common law set-off cases when working in these jurisdictions.