Etymology
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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.).

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Definitions of frequency

frequency (n.)
the number of occurrences within a given time period;
the frequency of his seizures increased as he grew older
the frequency of modulation was 40 cycles per second
Synonyms: frequence / oftenness
frequency (n.)
the ratio of the number of observations in a statistical category to the total number of observations;
Synonyms: relative frequency
frequency (n.)
the number of observations in a given statistical category;
Synonyms: absolute frequency
From wordnet.princeton.edu