What is another word for "idea"?

Roget's Thesaurus (1911) lists these synonyms for "idea": abandon, abandonment, abjure, abrogation, adage, admitted, all, analogy, aphorism, aphoristic, apophthegm, apothegm, approximation, argument, association, assumed, assumption, avast, away, axiom, axiomatic, back, bare, belief, believing, bid, bigotry, blind, blue, break, byword, catch, cave, cease, cessation, cession, cheese, childish, common, commonplace.