[ dih-fin-i-tiv ]
/ dɪˈfɪn ɪ tɪv /


most reliable or complete, as of a text, author, criticism, study, or the like: the definitive biography of Andrew Jackson.
serving to define, fix, or specify definitely: to clarify with a definitive statement.
having its fixed and final form; providing a solution or final answer; satisfying all criteria: the definitive treatment for an infection; a definitive answer to a dilemma.
Biology. fully developed or formed; complete.


a defining or limiting word, as an article, a demonstrative, or the like.
Philately. a stamp that is a regular issue and is usually on sale for an extended period of time.Compare commemorative(def 2).

Nearby words

  1. definite integral,
  2. definite relative clause,
  3. definite relative pronoun,
  4. definitely,
  5. definition,
  6. definitive host,
  7. definitive plumage,
  8. definitize,
  9. definitude,
  10. deflagrate

Origin of definitive

1350–1400; Middle English < Old French < Latin dēfīnītīvus, equivalent to dēfīnīt(us) (see definite) + -īvus -ive

Related forms
Can be confuseddefinite definitive Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for definitively

British Dictionary definitions for definitively


/ (dɪˈfɪnɪtɪv) /


serving to decide or settle finally; conclusive
most reliable, complete, or authoritativethe definitive reading of a text
serving to define or outline
zoology fully developed; completethe definitive form of a parasite
  1. (of postage stamps) permanently on sale
  2. (as noun)a definitive postage stamp


grammar a word indicating specificity of reference, such as the definite article or a demonstrative adjective or pronoun
Derived Formsdefinitively, adverbdefinitiveness, noun

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for definitively



late 14c., from Old French definitif (12c.), from Latin definitivus "explanatory, definitive," from past participle stem of definire (see define). Related: Definitively.

Online Etymology Dictionary, © 2010 Douglas Harper