From The Collaborative International Dictionary of English v.0.48 :
Contrapuntal \Con`tra*pun"tal\, a. [It. contrappunto
counterpoint. See Counterpoint.] (Mus.)
Pertaining to, or according to the rules of, counterpoint.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
contrapuntal
adj 1: relating to or characteristic of or according to the
rules of counterpoint; "contrapuntal base"
2: having two or more independent but harmonically related
melodic parts sounding together [syn: polyphonic,
contrapuntal] [ant: monophonic]