Pronunciation: (ik-span'siv), [key]
1. having a wide range or extent; comprehensive; extensive: expansive mountain scenery.
2. (of a person's character or speech) effusive, unrestrained, free, or open: Our expansive host welcomed us warmly.
3. tending to expand or capable of expanding.
4. causing expansion: the expansive force of heat.
5. working by expansion, as an engine.
6. Psychiatry.marked by an abnormal euphoric state and by delusions of grandeur.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

expansion waveexpansive bit
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