Definition of definitional in US English:

definitional

adjective

  • Relating to the exact meaning of a word or concept.

    ‘Gilbert makes a definitional distinction between “miners' towns” and “mining towns”’
    ‘the amendment is purely definitional’

Pronunciation

definitional

/ˌdefəˈniSH(ə)n(ə)l//ˌdɛfəˈnɪʃ(ə)n(ə)l/