breakup

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The act or an instance of breaking up, as a division, dispersal, or disintegration.
2. n. The discontinuance of a relationship, as a marriage or a friendship.
3. n. The cracking and shifting of ice in rivers or harbors during the spring.
4. n. A loss of control or composure.

Century Dictionary and Cyclopedia

1. n. A disruption; a dissolution of connection; a separation of a mass into parts; a disintegration; a disbandment.
2. Pertaining to or in celebration of the breaking up or termination of any society, association, meeting, or the like: as, a break-up party or ceremony.

Wiktionary

1. n. The act of breaking up; disintegration or division
2. n. The termination of a romantic or sexual relationship
3. n. A loss of emotional control; a breakdown

GNU Webster's 1913

1. n. Disruption; coming apart; a separation and dispersion of the parts or members.
2. n. the termination of a relationship; a break-up of the government; the break-up of a marriage; the break-up of a business partnership; the break-up of a comedy team.

WordNet 3.0

1. v. laugh unrestrainedly
2. v. cause to go into a solution
3. v. attack with or as if with a pickaxe of ice or rocky ground, for example
4. v. bring the association of to an end or cause to break up
5. v. suffer a nervous breakdown
6. v. release ice
7. v. set or keep apart
8. v. make a break in
9. v. destroy the completeness of a set of related items
10. v. take apart into its constituent pieces
11. v. discontinue an association or relation; go different ways
12. v. break or cause to break into pieces
13. v. close at the end of a session
14. v. to cause to separate and go in different directions
15. v. come apart
16. v. come to an end
17. v. break violently or noisily; smash.
18. v. separate (substances) into constituent elements or parts
19. v. cause to separate
20. n. coming apart
21. n. the termination or disintegration of a relationship (between persons or nations)