contronym

Etymology

From contr(a)- + -onym. Coined 1962 by Jack Herring. Note that the vowel of the suffix generally supersedes the vowel of the prefix, hence coined as contronym, rather than contranym.

Why this word is great

CONTRONYM — [Noun] A word that carries two opposing meanings, such as "sanction" (to approve or to penalize) or "dust" (to remove particles or to sprinkle them). From contra- ("against") + -onym ("name, word"), coined in 1962 by Jack Herring. Unlike "Janus word" (which may denote duality without opposition) or "auto-antonym" (which foregrounds self-contradiction), "contronym" captures the quiet tension of a single term holding its own negation. It is the "bolt" that secures a door or flees from it, the "left" that remains or departs, the "oversight" that watches closely or misses entirely—language’s sly admission that meaning, like light, depends on the angle of observation.

noun

A word that has two opposing meanings, such as cleave (“stick together” or “split apart”).“Near-synonym: enantioseme”