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Meaning of intergrade

in•ter•grade

Pronunciation: (n.in'tur-grād"v.in"tur-grād'), [key]
— n., v., -grad•ed, -grad•ing.
—n.
  1. an intermediate grade, form, stage, etc.
—v.i.
  1. to merge gradually, one into another, as different species through evolution.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.