"a syllogism in which one premise is omitted," in Aristotle, "an inference from likelihoods and signs," 1580s, from Latin enthymema, from Greek enthymema "thought, argument, piece of reasoning," from enthymesthai "to think, consider," literally "to keep in mind, take to heart," from en "in" (see en- (2)) + thymos "mind" (see fume (n.)). Related: Enthymematic.