Pronunciation: (rad'lib'), [key] Informal.
Usually Disparaging.a liberal, esp. a liberal politician, considered to have radical or extremist tendencies.
being or of such a liberal; liberal tending toward radical: The congressman accused his opponent of holding rad-lib ideas. Also,rad'/lib'.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.