plural of scheming

A fraudulent scheme where earlier investors are paid with the money taken from new investors, giving the impression that the scheme is a viable investment.

An illicit money-making investment scheme whereby early investors are paid primarily or wholly by later investors. Eventually all such schemes fail to the detriment of recent (later) investors.

(South Africa) A carpool; an arrangement whereby several people travel together in the same car.

plural of pyramid scheme

(metadata) The descriptive information for an arrangement or division of objects into groups based on characteristics which the objects have in common.

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.