1550-60; < Latinconceptum something conceived, orig. neuter of conceptus (past participle of concipere), equivalent to con-con- + cep- (variant stem of -cipere, combining form of capere to seize) + -tus past participle ending
1550s, from Medieval Latin conceptum "draft, abstract," in classical Latin "(a thing) conceived," from concep-, past participle stem of concipere "to take in" (see conceive). In some 16c. cases a refashioning of conceit (perhaps to avoid negative connotations).