Ma'anar ƙamus na kalmar "gwajin allo" tana nufin gwaji ko jiyya inda ake tantance mutum don dacewarsa don rawar da ya taka a fim, talabijin, ko shirya bidiyo. A gwajin allo, mutum yakan yi fage ko magana ɗaya kawai a gaban kyamara, wanda daraktan simintin gyare-gyare ko wasu masu yanke shawara su duba don tantance ko sun dace da rawar. Kalmar “allon gwajin” tana kuma iya komawa ga kowane irin gwaji ko kimantawa da ake yi ta amfani da allo ko duba, kamar gwajin nunin kwamfuta ko gwajin likitanci da ke amfani da na'urar gani.