S: (n) introduction (a new proposal) "they resisted the introduction of impractical alternatives"
S: (n) re-introduction (a proposal of something previously rejected) "they avoided a re-introduction of the old terminology"
S: (n) motion, question (a formal proposal for action made to a deliberative assembly for discussion and vote) "he made a motion to adjourn"; "she called for the question"
S: (n) hypothesis, possibility, theory (a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena) "a scientific hypothesis that survives experimental testing becomes a scientific theory"; "he proposed a fresh theory of alkalis that later was accepted in chemical practices"