1
[ noun ] the quality of recurring at intervals

Synonyms

cyclicity

Used in print

(Frank Oppenheimer, "Science and Fear-- A Discussion...)

This and other fears of the solar_system have disappeared gradually , first , with the Ptolemaic_system and its built-in concept of periodicity and_then , more firmly , with the Newtonian innovation of an universal force that could account quantitatively for both terrestrial and celestial motions .

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