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4861 ~σύμψυχος~ sumpsuchos \@soom’-psoo-khos\@ from 4862 and 5590; ; adj AV-of one accord 1; 1 1) of one mind, of one accord

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This word is made up of two words "sun" (together with) and psuchos (soul, self, inner life, or the seat of the feelings, desires, affections). So the word refers to being united in spirit or harmonious (A&G). Paul desired the Philippians to be united in their affections-one in Christ in all desires! Used only here in the NT. (Wayne Steury)