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âº A sweetheart is also a kind, generous person: Sheâs a sweetheart. (Definition of âsweetheartâ from the Cambridge Academic Content Dictionary Â© Cambridge University Press)
Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  spouse, partner, married person, mate, better half(noun) a person's partner in marriage. 2  collaborator, cooperator, partner, pardner(noun) an associate in an activity or endeavor or sphere of common interest. 3  partner(verb) a person who is a member of a partnership.