Definition of periodic
1a
: occurring or recurring at regular intervals
b
: occurring repeatedly from time to time
2a
: consisting of or containing a series of repeated stages, processes, or digits : cyclic
periodic decimals a periodic vibration
b
: being a function any value of which recurs at regular intervals
3
: expressed in or characterized by periodic sentences
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Merriam-Webster unabridged
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Time Traveler for periodic
The first known use of periodic was in 1650
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