root of unity
(redirected from Primitive root of unity)root of unity
[¦rüt əv ′yü·nəd·ē] (mathematics)
A root of unity in a field F is an element a in F such that a n = 1 for some positive integer n.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.