periodic function

/P IH0 R IY0 AA1 D IH0 K F AH0 NG K SH AH0 N/
noun
  1. 1

    Any function whose value repeats after the regular addition of a period to its independent variable; i.e., a function ƒ such that, for some positive constant p, ƒ(x + p) = ƒ(x) for all x.

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Source: https://en.wiktionary.org/wiki/periodic%20function