Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The quality or state of being periodic; recurrence at regular intervals.
  • n. The repetition of similar properties in chemical elements, as indicated by their positioning in the periodic table.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Recurrence of a woman's periods; menstruation.
  • n. The quality of being periodic; tendency to recur at regular intervals.
  • n. The quality of a function with a repeated set of values at regular intervals.

from the GNU version of the Collaborative International Dictionary of English

  • n. The quality or state of being periodical, or regularly recurrent.

from The Century Dictionary and Cyclopedia

  • n. Periodic character; habitual tendency or disposition to recur at stated intervals of time.
  • n. In physical, the number of recurrences of a periodic motion, such as a vibration, in a unit of time; specifically, in electricity, the number of complete periods or cycles per second of an alternating or oscillating current: same as frequency. The usual electrical frequencies are 25 and 60 in the United States and 50 in Europe.
  • n. In botany, the habit in a plant of adjusting its growth or the movements of its organs to regular changes in conditions (of light, heat, etc.), either annual or diurnal. Periodicity is also exhibited in some spontaneous movements not correlated with time of day or season. See phenology, sleep, 5, sensitive-plant, and periodic movement.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the quality of recurring at regular intervals

Etymologies

From French périodicité (Wiktionary)

Examples

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  • ...the interminably slow periodicity of the cycles of these lake tides.

    - Malcolm Lowry, October Ferry to Gabriola

    July 30, 2008