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• syn-
  syn-

  a prefix occurring in loanwords from Greek, having the same function as co- (synthesis; synoptic ); used, with the meaning “with,” “together,” in the formation of compound words (synsepalous ) or “synthetic” in such compounds (syngas ).
• syn.
  syn.

  abbreviation

  synonym.
• syn
  syn

  adverb

  a variant of syne 1

syn-

¹ American  

1. a prefix occurring in loanwords from Greek, having the same function as co- (synthesis; synoptic ); used, with the meaning “with,” “together,” in the formation of compound words (synsepalous ) or “synthetic” in such compounds (syngas ).

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syn. ² American  

abbreviation

1. synonym.

2. synonymous.

3. synonymy.

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syn- ¹ British  

prefix

1. with or together

   synecology

2. fusion

   syngamy

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syn ² British  

/ sɪn, saɪn /

adverb

1. a variant of syne 1

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syn. ³ British  

abbreviation

1. synonym(ous)

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Etymology

Origin of syn-

< Greek, combining form representing sýn with, together with