An Etymological Dictionary of Astronomy and Astrophysics

The number of complete oscillations per unit time of a vibrating system. The reciprocal of the → period, T.

Etymology (EN): From L. frequentia “assembly, multitude, crowd.”

Etymology (PE): Basâmad, from bas “many, much” (Mid.Pers. vas “many, much;” O.Pers. vasiy “at will, greatly, utterly;” Av. varəmi “I wish,” vasô, vasə “at one’s pleasure or will,” from vas- “to will, desire, wish”)

• âmad past stem of âmadan “to occur, to come, to become” (Mid.Pers. âmatan;
  O.Pers. gam- “to come; to go,” Av. gam- “to come; to go,” jamaiti “goes;” Proto-Iranian *āgmatani; Skt. gamati “goes;” Gk. bainein “to go, walk, step;” L. venire “to come;” Tocharian A käm- “to come;” O.H.G. queman “to come;” E. come; PIE root *gwem- “to go, come”).
  Feregi, from feré “much, more; increase; priority,” farâ(vân) “abundant,” Mid.Pers. frêh “more, much;” O.Pers. fra- “before, forth;”
  Av. frā, fərrā “forth, forward;” PIE base *pro-; cf. L. pro “on behalf of, in place of, before, for;” Gk. pro- “before, in front of.”