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sidereal rotation period
(astronomy) The sidereal day of a planet. (I.e., in the definition for "sidereal day", replace "Earth" by the given planet.)
operational service period
A period during which a telecommunications service remains in an operational state.
psychological refractory period
(psychology) A delay to the second response to two closely-spaced stimuli
cooling-off period
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.
periodic continued fraction
(mathematics) A continued fraction with a sequence of numerators and denominators that repeat indefinitely
periodic continued fractions
short period comet
Alternative form of short-period comet
non-periodic comet
Alternative spelling of nonperiodic comet
probationary periods
periods of time
plural of period of time