noun An artful deviation from the ordinary arrangement of words. .mw-parser-output .defdate{font-size:smaller}
noun A representation of the aspects of the celestial bodies for any moment or at a given event.
noun A systematic plan of future action.
noun A plot or secret, devious plan.
Her brain is continually fermenting new schemes.
noun An orderly combination of related parts.
noun A chart or diagram of a system or object.
noun A mathematical structure that generalizes the notion of an algebraic variety in several ways, such as taking account of multiplicities and allowing "varieties" defined over any commutative ring. Formally, a locally ringed space that admits a covering by open sets, each of which is isomorphic to an affine scheme (i.e. the spectrum of some commutative ring).