Etymology
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Words related to frequent

frequence (n.)
1530s, "an assembling in large numbers," from French fréquence, from Latin frequentia "an assembling in great numbers" (see frequent). From c. 1600 as "frequent occurrence."
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frequency (n.)
1550s, "state of being crowded" (now obsolete); 1640s, "fact of occurring often;" from Latin frequentia "an assembling in great numbers, a crowding; crowd, multitude, throng," from frequentem (see frequent). Sense in physics, "rate of recurrence," especially of a vibration, is from 1831. In radio electronics, frequency modulation (1922, abbreviated F.M.) as a system of broadcasting is distinguished from amplitude modulation (or A.M.).
frequentative (n.)

"verb which expresses repetition of action," 1520s, from French fréquentatif, from Late Latin frequentativus "serving to denote the repetition of an act," from Latin frequentat-, past-participle stem of frequentare "visit regularly; do frequently, repeat," from frequentem (see frequent (adj.)). Frequentive is considered incorrect, because -ive adjectives are normally formed on the Latin past participle.

frequently (adv.)
"often and at short intervals," 1530s, from frequent (adj.) + -ly (2).
infrequency (n.)
1670s, fact of being infrequent," from Latin infrequentia "a small number, thinness, scantiness," abstract noun from infrequentem (nominative infrequens) "occurring seldom, unusual; not crowded, absent," from in- "not" (see in- (1)) + frequens (see frequent). Older in this sense is infrequence (1640s). Earlier infrequency was used in a now-obsolete sense of "state of being unfrequented" (c. 1600).
infrequent (adj.)
1530s, "little used" (now obsolete); 1610s, "not occurring often," from Latin infrequentem (nominative infrequens) "occurring seldom, unusual; not crowded, absent," from in- "not" (see in- (1)) + frequens "repeated, regular, constant, often" (see frequent). Related: Infrequently.
unfrequented (adj.)
1580s, from un- (1) "not" + past participle of frequent (v.).