Crossword clue: a generic term, or a term applicable in the same sense to all the species it embraces. 2. a word having but one meaning.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion