Definition of synonymity in English:

synonymity

noun

  • See synonym

    • ‘The problem, as Mates points out, is that if anybody even doubts that "whoever believes that D believes thatD", then a traditionalist's explanation of synonymity is wrong.’
    • ‘You can bet that it ended up suggesting a synonymity of liquor with very good times to a much younger age group and a far wider social spectrum.’
    • ‘He wrote about perspective phenomena, but the etymological synonymity of optics and perspective has often led to the misconception that he wrote about perspective constructions.’

Pronunciation

synonymity

/sɪnəˈnɪmɪti/