VERB (1)

1. combine (a radio frequency wave) with a locally generated wave of a different frequency so as to produce a new frequency equal to the sum or the difference between the two;


ADJECTIVE (1)

1. of or relating to the beat produced by heterodyning two oscillations;

WordNet (r) 3.0 (2006):

heterodyne
    adj 1: of or relating to the beat produced by heterodyning two
           oscillations
    v 1: combine (a radio frequency wave) with a locally generated
         wave of a different frequency so as to produce a new
         frequency equal to the sum or the difference between the
         two