American Heritage Dictionary
(1)
Century Dictionary
(2)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
This wasn't a problem of polyphony or note stealing, as I'm pretty sure I didn't hit the 25 voice limit.— EM411.com
She's fond of polyphony, rhythmic and melodic complexity, extended improvisation, and she makes it known in her whirlwind performances that take the audience by storm.— The Tech - MIT's Student Newspaper
The earliest known example of polyphony, discovered in a document called the "Winchester Troper," adds voices to the chant moving at parallel intervals, such as the fifth and octave, a practice called [[organum]].— Conservapedia - Recent changes [en]

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a year.