Used other than figuratively or idiomatically: see scheme, theory. / (algebraic geometry) The branch of mathematics that concerns schemes (algebraic varieties equipped with the Zariski topology).

plural of group scheme

(category theory, scheme theory) A group object that is an object in a category of schemes; a scheme that has certain properties that generalise the concept of group.

An arch less than a semicircle.

plural of scheme arch

An experiment carried out to test a new idea or concept before full-scale introduction; a pilot study.

plural of pilot scheme

(Britain, finance) A way of investing money with other people to participate in a wider range of investments than may be feasible for an individual investor, and to share the costs of doing so.

plural of collective investment scheme

Alternative form of grand scheme