Wordnet 3.0
NOUN (1)
1.
support paid by one half of an unmarried partnership after the relationship ends;
The Collaborative International Dictionary of English v.0.48:
palimony \pal"i*mo`ny\ (p[a^]l"[i^]*m[=o]`n[y^]), n. [pal +
alimony. (ca. 1975)]
a form of alimony paid to a former partner in a romantic
relationship after a period of living together, even though
the two persons involved were not married to each other. The
absence of a formal marriage distinguishes it from alimony.
[PJC]
WordNet (r) 3.0 (2006):
palimony
n 1: support paid by one half of an unmarried partnership after
the relationship ends