Source : Webster's Revised Unabridged Dictionary (1913)

Acceptable \Ac*cept"a*ble\, a. [F. acceptable, L. acceptabilis,
   fr. acceptare.]
   Capable, worthy, or sure of being accepted or received with
   pleasure; pleasing to a receiver; gratifying; agreeable;
   welcome; as, an acceptable present, one acceptable to us.

Source : WordNet®

acceptable
     adj 1: worthy of acceptance or satisfactory; "acceptable levels of
            radiation"; "performances varied from acceptable to
            excellent" [ant: {unacceptable}]
     2: judged to be in conformity with approved usage; "acceptable
        English usage" [syn: {accepted}]
     3: meeting requirements; "the step makes a satisfactory seat"
        [syn: {satisfactory}]
     4: adequate for the purpose; "the water was acceptable for
        drinking"