The Free On-line Dictionary of Computing (30 December 2018):

truth table

    A table listing all possible combinations of inputs
   and the corresponding output of a Boolean function such as
   AND, OR, NOT, IMPLIES, XOR, NAND, NOR.  Truth
   tables can be used as a means of representing a function or as
   an aid in designing a circuit to implement it.

   (1998-07-30)