ETYM For parcener, influenced by part.
1. An associate in any business or occupation; esp., a member of a partnership.
2. One who shares something with an other; a partaker; an associate.
3. A husband or a wife.
4. An unmarried companion.
5. Either one of a couple who dance together.

ETYM Old Fren. espous, espos, fem. espouse, French époux, épouse, from Latin sponsus, sponsa, prop. p. p. of spondere, sponsum, to promise solemnly, to engage one's self. Related to Despond, Espouse, respond, Sponsor.
A person's partner in marriage; SYN. partner, married person, mate, consort.