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Etymology 1
Compare.

Verb

 * 1) to be made to go back
 * 2)  to return or come back again and again to
 * 3) to alternate, to move to and fro
 * 4) to waver, to hesitate
 * 5) to make repeated efforts
 * 6) to be repeated frequently, to be reiterated
 * 7)  to reiterate
 * 8)  to frequent
 * 9) to be frequently refused or repelled
 * 10) to remember or remind frequently

Noun

 * 1) reluctance, indecision, hesitation, wavering
 * 2) frequency
 * 1) frequency