#136.  Frequency. —­ N. frequency, oftness[obs3], oftenness[obs3],
commonness; repetition &c. 104; normality &c. 80; example (conformity) 82; routine, custom (habit) 613.
     regularity, uniformity, constancy, clock-work precision; punctuality
&c. (exactness) 494; even tenor; system; routine &c. (custom) 613; formula; rule &c. (form, regulation) 697; keynote, standard, model; precedent &c. (prototype) 22; conformity &c. 82. 
     V. recur &c. 104; do nothing but; keep, keep on. 
     Adj. frequent, many times, not rare, thickcoming[obs3], incessant,
perpetual, continual, steady, constant, thick; uniform; repeated &c. 104; customary &c. 613 (habit) 613; regular (normal) 80; according to rule &c. (conformable) 82.
     common, everyday, usual, ordinary, familiar.
     old-hat, boring, well-known, trivial. 
     Adv. often, oft; ofttimes[obs3], oftentimes; frequently; repeatedly
&c. 104; unseldom[obs3], not unfrequently[obs3]; in quick succession, in rapid succession; many a time and oft; daily, hourly &c.; every day, every hour, every moment &c.
     perpetually, continually, constantly, incessantly, without ceasing, at
all times, daily and hourly, night and day, day and night, day after day, morning noon and night, ever anon, invariably (habit) 613.
     most often; commonly &c. (habitually) 613.
     sometimes, occasionally, at times, now and then, from time to time,
there being times when, toties quoties[Lat][obs3], often enough, when the mood strikes, again and again.

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     #137.  Infrequency.—­ N. infrequency, rareness, rarity; fewness &c.
103; seldomness[obs3]; uncommonness. 
     V. be rare &c. adj. 
     Adj. unfrequent[obs3], infrequent; rare, rare as a blue diamond; few
&c. 103; scarce; almost unheard of, unprecedented, which has not occurred within the memory of the oldest inhabitant, not within one’s previous experience; not since Adam[obs3].
     scarce as hen’s teeth; one in a million; few and far between. 
     Adv. seldom, rarely, scarcely, hardly; not often, not much,
infrequently, unfrequently[obs3], unoften[obs3]; scarcely, scarcely ever, hardly ever; once in a blue moon.
     once; once in a blue moon; once in a million years; once for all, once
in a way; pro hac vice[Lat]. 
     Phr. ein mal kein mal[German].

     #138.  Regularity of recurrence.  Periodicity. —­ N. periodicity,
intermittence; beat; oscillation &c. 314; pulse, pulsation; rhythm; alternation, alternateness, alternativeness, alternity[obs3].
     bout, round, revolution, rotation, turn, say.
     anniversary, jubilee, centenary.
     catamenia[obs3]; courses, menses, menstrual flux.
     [Regularity of return] rota, cycle, period, stated time, routine; days
of the week; Sunday, Monday &c.; months of the year; January &c.; feast, fast &c.; Christmas, Easter, New Year’s day &c.