either member of a married pair in relation to the other; one's husband or wife.
verb (used with object),spoused,spous·ing.
Obsolete. to join, give, or take in marriage.
Origin of spouse
1150–1200; (noun) Middle English < Old Frenchspous (masculine), spouse (feminine) (aphetic for espous, espouse) < Latinspōnsus,spōnsa literally, pledged (man, woman) (noun uses of past participle of spondēre to pledge), equivalent to spond- verb stem + -tus, -ta past participle suffix; (v.) Middle Englishspousen < Old Frenchesp(o)user; cf. espouse
Related formsspouse·hood, nounspouse·less, adjectiveun·spoused, adjective
c.1200, "a married woman in relation to her husband" (also of men), from Old French spus (fem. spuse), from Latin sponsus "bridegroom" (fem. sponsa "bride"), from masc. and fem. past participle of spondere "to bind oneself, promise solemnly," from PIE *spend- "to make an offering, perform a rite" (see spondee). Spouse-breach (early 13c.) was an old name for "adultery."