Merriam-Webster's Collegiate® Dictionary, 11th Edition
FREQUENT
I. transitive verb
Date: 15th century
to associate with, be in, or resort to often or habitually , to read systematically or habitually, frequentation noun frequenter noun
II. adjective
Etymology: Middle English, ample, from Middle French or Latin; Middle French, crowded, from Latin frequent-, frequens
Date: 1531
1. common , usual , happening at short intervals ; often repeated or occurring , full , thronged, acting or returning regularly or often , intimate , familiar , frequentness noun