Middle english, from old french spous, from latin spnsus, from past participle of spondre, to pledge see spend- in indo-european roots.
Spouse definition, either member of a married pair in relation to the other ones husband or wife.
Spouse definition and meaning | Collins English Dictionary
(noun spaus, spauz, verb spauz, spaus) (verb spoused, spousing) noun. Either member of a married pair in relation to the other ones husband or wife.