a book (or manuscript) consisting of large sheets of paper folded in the middle to make two leaves or four pages; "the first folio of Shakespeare's plays"
a line spoken by an actor to the audience but not intended for others on the stage
in reserve; not for immediate use; "started setting aside money to buy a car"; "put something by for her old age"; "has a nest egg tucked away for a rainy day"
on or to one side; "step aside"; "stood aside to let him pass"; "threw the book aside"; "put her sewing aside when he entered"
out of the way (especially away from one's thoughts); "brush the objections aside"; "pushed all doubts away"
placed or kept separate and distinct as for a purpose; "had a feeling of being set apart"; "quality sets it apart"; "a day set aside for relaxing"
a tentative theory about 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"
a proposal intended to explain certain facts or observations