WordNet (r) 3.0 (2006):

logic gate
    n 1: a computer circuit with several inputs but only one output
         that can be activated by particular combinations of inputs
         [syn: gate, logic gate]

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

logic gate

   An integrated circuit or other device whose inputs and
   outputs represent Boolean or binary values as voltages
   (TTL uses 0V for False or 0, +5V for True or 1).  Different
   gates implement different Boolean functions: AND, OR,
   NAND, NOR (these may take two or more inputs) NOT (one
   input), XOR (two inputs).  NOT, NAND and NOR are often
   constructed from single transistors and the other gates made
   from combinations of these basic ones.  These functions are
   all combinatorial logic functions, i.e. their outputs depend
   only on their inputs and there is no internal state.  Gates
   with state, such as latches and flip-flops, are
   constructed by feeding some of their outputs back to their
   inputs.

   (1995-02-08)