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Wiktionary(3.00 / 2 votes)Rate this definition: 1  serve(Noun) the act of putting the ball or shuttlecock in play in various games. 2  serve(Noun) A portion of food, a serving. 3  serve(Verb) To be a formal servant for (a god or deity); to worship in an official capacity. 4  serve(Verb) To be a servant for; to work for, to be employed by.
Definition of on behalf of someone. 1  1 : as a representative of someone The teacher accepted the award on behalf of the whole class. 2  2 or US in behalf of someone or in someone's behalf : for the benefit of someone : in support of someone She spoke in behalf of the other candidate. They're willing to do anything on their child's behalf.