definitive
1. [ adjective ] clearly defined or formulated
Synonyms: unequivocal
Examples:

"the plain and unequivocal language of the laws"- R.B.Taney

Related terms: explicit
2. [ adjective ] of recognized authority or excellence
Synonyms: classical authoritative
Examples:

"the definitive work on Greece" "classical methods of navigation"

Related terms: standard
3. [ adjective ] supplying or being a final or conclusive settlement
Synonyms: determinate
Examples:

"a definitive verdict" "a determinate answer to the problem"

Related terms: conclusive
Similar spelling:   definite
  definition
  definitely
  definiteness
  deviant
  defiant
  defined
  defiantly
  deafened