Entry 1 sense Webster, 1913 Ambassadorial /ăm-băsˌ-əd-ôr'-ē-əl/ · Am·bas·sa·do·ri·al · IPA /æm.bæs.əˈdɔɹ.iəl/ 01 a. Of or pertaining to an ambassador. 1. Of or pertaining to an ambassador.