Entry 1 sense Webster, 1913 Actuarial /ăkˌ-cho͞oˌ-ĕr'-ē-əl/ · Ac·tu·a·ri·al · IPA /æk.tjuˈɛəɹ.i.əl/ 01 a. Of or pertaining to actuaries; as, the actuarial value of an annuity. 1. Of or pertaining to actuaries; as, the actuarial value of an annuity.