Source : Webster's Revised Unabridged Dictionary (1913)

Ofttimes \Oft"times`\, adv. [Oft + time. Cf. {-wards}.]
   Frequently; often. --Milton.

Source : WordNet®

ofttimes
     adv : many times at short intervals; "we often met over a cup of
           coffee" [syn: {frequently}, {often}, {oftentimes}, {oft}]
           [ant: {rarely}, {infrequently}]