isolation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act of isolating.
• noun The quality or condition of being isolated.

from The Century Dictionary.

• noun The state of being isolated or alone.
• noun Specifically, removal from communication or contact with others; also, the condition of being so removed.
• noun In psychology, the process whereby one selects a certain quality of an object for consideration, to the neglect of other qualities; selection by attention.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of isolating, or the state of being isolated; insulation; separation; loneliness.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The state of being isolated, detached, or separated.
• noun The act of isolating.
• noun diplomacy, of a country The state of not having diplomatic relations with other countries (either with most or all other countries, or with specified other countries).
• noun chemistry The obtaining of an element from one of its compounds, or of a compound from a mixture
• noun medicine The separation of a patient, suffering from a contagious disease, from contact with others
• noun computing a database property that determines when and how changes made in one transaction are visible to other concurrent transactions

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a state of separation between persons or groups
• noun a feeling of being disliked and alone
• noun a country's withdrawal from international politics
• noun the act of isolating something; setting something apart from others
• noun (psychiatry) a defense mechanism in which memory of an unacceptable act or impulse is separated from the emotion originally associated with it