Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class I. Words Expressing Abstract Relations
Section VI. Time
3. Recurrent Time

136. Frequency.

   NOUN:FREQUENCY, frequence, oftness [rare], oftenness [rare], quotiety [rare]; repetition [See Repetition].
   VERB:KEEP, keep on; recur [See Repetition]; do nothing but.
   ADJECTIVE:FREQUENT, often [archaic], many, many times, not rare, thickcoming, incessant, perpetual, continual, constant, repeated [See Repetition]; habitual [See Habit]; hourly [See Regularity of recurrence. Periodicity].
   ADVERB:OFTEN, oft, ofttime [archaic], ofttimes, oftentimes; oftentime [rare], oftentide [obs.], not seldom, frequently; repeatedly [See Repetition]; unseldom, not unfrequently; in quick succession, in rapid succession; many a time and oft; oftly [rare], daily, hourly &c.; every day, every hour, every moment &c.
  PERPETUALLY, continually, constantly, incessantly, unchangingly, steadfastly, without ceasing, at all times, daily and hourly, night and day, day and night, day after day, morning noon and night, ever and anon.
  COMMONLY (habitually) [See Habit]; most often.
  SOMETIMES, occasionally, at times, now and then, from time to time, there being times when, toties quoties [L.], often enough, again and again.
   QUOTATION:I’ll do and I’ll do and I’ll do!—>146;ll do! —Macbeth