(medicine) peritonitis which results from the escape of the contents of the digestive tract into the peritoneum

(computer hardware) An electronic device that is outside the computer's system unit (external to the computer's enclosing case), but used by the computer to which it is connected, such as a printer or a scanner.

The period of time during which ovulation takes place. / The period of time between ovulations.

(physics) A characteristic of the transition of a system or process from regular motion to chaos, in which the period of one of its parameters is seen to double.

(now historical) A wig, especially any kind of stylised wig as formerly worn by men and women.

(transitive) To dress with a periwig, or with false hair; to bewig.

(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 all x.

The 45-year reign of Emperor Meiji (1868-1912). During this time, Japan started its modernization and rose to world power status.

(idiomatic) A length of time during which rules or penalties are waived or deferred.

A warm, dry postglacial interval.