Definition of substantival in US English:

substantival

adjective

  • See substantive

    • ‘It is clear that we must proceed with great care if we are to employ this substantival terminology.’
    • ‘Absolute theories are called ‘substantival’ or ‘substantial’ if they require spacetime to be a substance.’
    • ‘Here, however, its position appears to suggest that it is a substantival adjective qualifying ‘inhibition’.’

Pronunciation

substantival

/ˈˌsəbstənˈtīvəl/