1.  breakup(n = noun.act) dissolution - the termination or disintegration of a relationship (between persons or nations); Array
is a kind of conclusion, ending, termination
has particulars: splitsville, annulment, invalidation
Derived form verb break up₂

2.  breakup(n = noun.event) detachment, separation - coming apart; Array
is a kind of alteration, change, modification
has particulars: breach, break, falling out, rift, rupture, severance, break
Derived forms verb break up₃, verb break up₂

1.  Disruption; coming apart; a separation and dispersion of the parts or members; as, a break-up of a meeting, assembly, or dinner party; the break-up of a spacecraft on re-entry into the atmosphere. [1913 Webster]

2.  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 1.5]

breakup, n.
1 disintegration, collapse.
2 dispersal.

N  divorce, divorcement, separation, judicial separation, separate maintenance, separatio a mensa et thoro, separatio a vinculo matrimonii, trial separation, breakup, annulment, widowhood, viduity, weeds, widow, widower, relict, dowager, divorcee, cuckold, grass widow, grass widower, merry widow.