English

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English numbers (edit)
 ←  11 12 13  → 
    Cardinal: twelve
    Ordinal: twelfth
    Latinate ordinal: duodecimary
    Adverbial: twelve times
    Multiplier: twelvefold
    Latinate multiplier: duodecuple
    Group collective: dozen, twelvesome
    Greek or Latinate collective: duodecad, duodecade
    Greek collective prefix: dodeca-
    Latinate collective prefix: duodeca-
    Fractional: twelfth, dozenth
    Latinate fractional prefix: unci-
    Greek prefix: dodecato-
    Number of musicians: duodecet

Etymology

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twelve +‎ -some

Noun

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twelvesome (plural twelvesomes)

  1. A group of twelve persons or things.