(mathematics) Any function whose value repeats after the regular addition of a period to its independent variable; i.e., a function ƒ such that, for some positive constant p, ƒ(x + p) = ƒ(x) for al...

A card that contains a microchip; a smart card.

Abbreviation of excluding.

A river in Cumbria, England, which joins the River Eden at Carlisle.