Definition
Mutuatus is a Latin term of pleading and practice meaning a loan or borrowing of money. In the common law writ system, it appeared as a technical term of art in declarations on the common counts, particularly the count for money lent, where the pleader would aver that the defendant was indebted to the plaintiff for money loaned (mutuatus). The term captures both the act of borrowing and the resulting obligation — the debtor's receipt of money with an implied or express duty to repay.
Why It Matters in Research
Mutuatus appears almost exclusively in early and mid-nineteenth century procedural and pleading sources. Researchers working in common law pleading materials, particularly those concerning the common counts in assumpsit, will encounter the term in declarations, treatises on practice, and older form books. It is a term of pleading form rather than substantive doctrine — its significance lies in its function within the technical language of writ-era practice, not in any independent legal principle it defines.
The core trap for researchers: mutuatus is not a cause of action itself, but a term embedded within the structure of the indebitatus assumpsit count for money lent. A researcher unfamiliar with the common count system may search for mutuatus as a standalone claim or doctrine and come away empty-handed. The productive search is through the broader literature on indebitatus assumpsit and the common counts, where mutuatus appears as one of several operative Latin terms of pleading.
Because the term belongs to the era of formal common law pleading, it drops out of legal usage almost entirely after code pleading reforms swept through American jurisdictions in the mid-to-late nineteenth century. Researchers working in post-reform sources will not find it; its natural habitat is pre-code practice materials.
Historical Dictionary Support
Bouvier's is the primary dictionary source for this term, and the entry is characteristically spare: a loan of money, a borrowing, with references to Gilbert on Common Pleas and Archbold's Practice. The references to Gilbert and Archbold locate mutuatus firmly within the procedural literature of common law pleading rather than substantive contract or lending law. Burrill's Law Dictionary, cited by Bouvier, similarly treats the term as a pleading artifact.
No significant divergence exists among historical sources on the meaning of the term — there is no definitional dispute to flag. What the historical sources collectively omit is any discussion of the term's trajectory: because mutuatus was a creature of formal pleading, the dictionaries that captured it were writing at or near the end of its practical life. Code pleading reforms, beginning with the New York Field Code of 1848 and spreading across American jurisdictions, abolished the technical common counts and with them the pleading vocabulary that made mutuatus necessary.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Indebitatus Assumpsit; Common Counts; Pleading (Common Law)