plural of period doubling

(psychology, biology) A maturational stage in the lifespan of an organism during which the nervous system is especially sensitive to certain environmental stimuli.

plural of periodic sentence

plural of periodical cicada

(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

(astronomy) A disturbance in the motion of a planet due to its position in its orbit relative to another planet.

The length of time during which an activity occurs or a condition remains. It may be measured either in seconds or in millions of years, depending upon the nature of the activity of condition being considered.

plural of periodic inequality

plural of periodic month