earnest and conscientious activity intended to do or accomplish something; "made an effort to cover all the reading material"; "wished him luck in his endeavor"; "she gave it a good try"
(music) the section of a movement (especially in sonata form) where the major musical themes first occur
an account that sets forth the meaning or intent of a writing or discourse; "we would have understood the play better if there had been some initial exposition of the background"
a systematic interpretation or explanation (usually written) of a specific topic
diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal