noun
1. a state of separation between persons or groups
2. a feeling of being disliked and alone
3. the act of isolating something; setting something apart from others
4. (psychiatry) a defense mechanism in which memory of an unacceptable act or impulse is separated from the emotion originally associated with it
5. a country's withdrawal from international politics; "he opposed a policy of American isolation"

"isolation." WordNet® 3.0. Princeton University. 07 Feb. 2008. .