Bank with confidence through competitive, fdic insured products. Definition of 'syn' syn in british english (saɪn , sɪn ) adverb, preposition, conjunction Used, with the meaning “with,” “together,” in the formation of compound words (synsepalous ) or “synthetic” in such compounds (syngas ). In loanwords from greek, meaning “with,” “together” Did you actually mean synonym or synonymy?
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