- no longer in use or practice; discarded
- no longer in fashion; out-of-date; passé
- Biol. rudimentary or poorly developed as compared with its counterpart in other individuals of a related species, the opposite sex, etc.; vestigial: said of an organ, etc.
Origin of obsoleteClassical Latin obsoletus, past participle of obsolescere, to go out of use from ob- (see ob-) + an unverified form -solescere ( from exolescere, to grow out of use from ex-, ex- + uncertain or unknown; perhaps alescere, to increase: see adolescent)
transitive verb-·let·ed, -·let·ing