はいぐうしゃ配偶者haiguusha
1.
A term used to refer to one half of a married couple, emphasizing the relationship between the two individuals as partners in matrimony.
2.
A legal designation in which one person in a marriage is identified in relation to their counterpart, highlighting the mutual recognition in the context of marriage.
3.
A word that conveys the notion of companionship and partnership within the framework of a marital relationship, applicable to both husbands and wives.
Example:
彼女は彼が貧しいときも彼を支えるすばらしい配偶者だった。