(inorganic chemistry) HIO₄ or H₅IO₆, the oxyacids of iodine in which iodine has the highest oxidation number; H₅IO₆ is a white crystalline substance (HIO₄ is not stable), and both are strong oxidizing agents.

the average interval between fertilization and birth of a mammal; ranges from 13 days for the opossum to 626 days for the Indian elephant

(astronomy) Synonym of non-periodic

(astronomy) Having an orbital period of less than 200 years, especially said of comets

(music) The musical period of time following the Renaissance, extending roughly between 1600-1750.

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.

(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.