Definition of Assumpsit:

  1. Expressed or implied but unwritten promise or undertaking to perform an act or to pay a sum. Court action in which a seller sues a buyer for good supplied against an oral order but not paid-for is an assumpsit action. Latin for, he undertook.

  2. A plea in an action of assumpsit by which the defendant denies having made any promise or undertaking.

Meaning of Assumpsit & Assumpsit Definition