Entry 1 sense Webster, 1913 Acceptableness /(ăk*sĕpt"ȧ*b'l*nĕs)/ · Ac·cept·a·ble·ness · IPA /ækˈsɛp.tə.bəl.nəs/ 01 n. The quality of being acceptable, or suitable to be favorably received; acceptability. 1. The quality of being acceptable, or suitable to be favorably received; acceptability.