1. Pertaining to the predefined initial, original, or specific setting, condition, value, or action a system, such as a computer component, will assume, use, or take in the absence of instructions from the user. 2. The predefined initial, original, or specific setting, condition, value, or action a system, such as a computer component, will assume, use, or take in the absence of instructions from the user. See system default. See also component,  computer,  condition,  instruction,  set,  user,  value.