(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

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

(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.

(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.

A relatively brief period when a new leader is given greater leeway with respect to changes he or she wishes to make.

(historical) The period of Egyptian history from the end of the Third Intermediate Period to the conquest of Egypt by Alexander the Great (the 26th through 31st dynasties), characterized by alternating periods of native and Persian rule.

Synonym of time period