(accounting) A system of assessing a business' inventory in which updates are made on a periodic basis, so that a completely accurate account is only available immediately after the update.

A period during which a telecommunications service remains in an operational state.

(psychology) A delay to the second response to two closely-spaced stimuli

A length of time in which the two sides to a purchase agreement, or contract can think things over and cancel with no penalty. This period is often stipulated by national law. In the UK it is currently (2008) 14 days. In many countries it is 10 days.

(astronomy) The sidereal day of a planet. (I.e., in the definition for "sidereal day", replace "Earth" by the given planet.)

(astronomy) The sidereal year of a planet. (I.e., in the definition for "sidereal year", replace "Earth" by the given planet.)

plural of short-period comet

(astronomy) Any periodic comet with an orbital period of less than 200 years.

plural of short period comet

Alternative form of short-period comet