What is Spouse?

Legal Definition
A spouse is a life partner in a holy matrimony, marriage, civil union, domestic partnership or common-law marriage. The term is gender neutral, whereas a male spouse is a husband and a female spouse is a wife. Although a spouse is a form of significant other, the latter term also includes non-marital partners who play a social role similar to that of a spouse, but do not have rights and duties reserved by law to a spouse.
-- Wikipedia
Legal Definition
a term that is used to describe a person's husband or wife.
Legal Definition
A husband or wife.
-- Ballentine's Law Dictionary