Entry 1 sense Webster, 1913 Interjacent · In·ter·ja·cent · IPA /ˌɪntəɹˈd͡ʒeɪsənt/ 01 a. Lying or being between or among; intervening; as, interjacent isles. 1. Lying or being between or among; intervening; as, interjacent isles.