intergrade Syllabification: (in·ter·grade)Definition of intergrade verb Pronunciation: /ˌintərˈgrād/ [no object] Biology pass into another form by a series of intervening forms:they have several forms that intergrade with each other noun Pronunciation: /ˈintərˌgrād/ a form resulting from intergrading. Derivatives intergradationPronunciation: /-grāˈdāSHən/ noun intergrade in other Oxford dictionaries Definition of intergrade in the British & World English dictionary