betimes

1. In good time; early: "A beneficent microclimate brings out the camellias betimes" (John Russell).
2. Once in a while; on occasion.
3. Archaic. Quickly; soon.

[Middle English bitimes : bi, by; see by¹ + time, time; see time + -es, adv. suff.; see -s³.]

adverb

1. Before the expected time: ahead, beforehand, early. Idioms: ahead of time, in advance, with time to spare. See time.
2. Once in a while; at times: intermittently, occasionally, periodically, sometimes, sporadically. Idioms: ever andagainanon, now andagainthen. See continue/stop/pause.

The adverb has one meaning:

Meaning #1: in good time
  Synonym: early