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The Collaborative International Dictionary
Irrelative repetition

Irrelative \Ir*rel"a*tive\, a. Not relative; without mutual relations; unconnected. -- Ir*rel"a*tive*ly, adv.

Irrelative chords (Mus.), those having no common tone.

Irrelative repetition (Biol.), the multiplication of parts that serve for a common purpose, but have no mutual dependence or connection.
--Owen.