From The Collaborative International Dictionary of English v.0.48 [gcide]:
Frequently \Fre*quent*ly\, adv.
At frequent or short intervals; many times; often;
repeatedly; commonly.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
frequently
adv 1: many times at short intervals; "we often met over a cup
of coffee" [syn: frequently, often, oftentimes,
oft, ofttimes] [ant: infrequently, rarely,
seldom]