'Definitely' definitions:

Definition of 'definitely'

From: WordNet
adverb
Without question and beyond doubt; "it was decidedly too expensive"; "she told him off in spades"; "by all odds they should win" [syn: decidedly, unquestionably, emphatically, definitely, in spades, by all odds]

Definition of 'Definitely'

From: GCIDE
  • Definitely \Def"i*nite*ly\, adv. In a definite manner; with precision; precisely; determinately. [1913 Webster]

Synonyms of 'definitely'

From: Moby Thesaurus