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1.
Nausea is a feeling as if you're about to vomit. Vomiting usually relieves this feeling. Nausea is not self-induced like vomiting sometimes is. Nausea is your body's response in saying "I don't like whats in my stomach."
I had too much chinese food; i was overcome with nausea.
by xxyuli August 23, 2006
 
2.
A nasty feeling that usually leads to vomiting. This feeling sends an unusual taste through the mouth causing it to water and results in a look of disgust.
I feel so nauseated that I think I'm going to vomit !
by *waterlover* March 04, 2009