1. An action based on the defendant’s breach of an implied promise to pay a debt to the plaintiff. — aka common assumpsit; indebitatus assumpsit. 
1. Assumpsit in the common courts: indebitatus assumpsit, quantum meruit, quantum money paid, and insimul computassent or count on account states. 1 Am J2d Actions § 13. 
Excerpt from Benjamin J. Shipman’s Handbook of Common-Law Pleading (Henry Winthrop Ballantine ed., 3d. 1923):
“General assumpsit is brought for breach of a fictitious or implied promise raised by law from a debt founded upon an executed consideration. The basis of the action is the promise implied by law from the performance of the consideration, or from a debt or legal duty resting upon the defendant.” 
Excerpt from Charles Herman Kinnane’s A First Book of Anglo-American Law (2d ed. 1952):
“[T]he word ‘assumpsit’ suggest[s] the making of a promise. While that is true in the case of the action of special assumpsit, the promise alleged in the action of general assumpsit was only a fiction. Accordingly in the latter action, the work ‘assumpsit’ no more means that an obligation exists as the result of making a contract, than that a contract is involved because the obligation is described as quasi-contractual.” 
Disclaimer: All material throughout this website is compiled in accordance with Fair Use.
: Black’s Law Dictionary Deluxe Tenth Edition by Henry Campbell Black & Editor in Chief Bryan A. Garner. ISBN: 978-0-314-62130-6
: Ballantine’s Law Dictionary with Pronunciations
Third Edition by James A. Ballantine (James Arthur 1871-1949). Edited by William S. Anderson. © 1969 by THE LAWYER’S CO-OPERATIVE PUBLISHING COMPANY. Library of Congress Catalog Card No. 68-30931
: Benjamin J. Shipman, Handbook of Common-Law Pleading § 59, t 153 (Henry Winthrop Ballantine ed., 3d. 1923)
: Charles Herman Kinnane, A First Book of Anglo-American Law 633-34 (2d ed. 1952)
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