English

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English numbers (edit)
 ←  10 11 12  → [a], [b]
    Cardinal: eleven
    Ordinal: eleventh
    Latinate ordinal: undecimary
    Adverbial: eleven times
    Multiplier: elevenfold
    Latinate multiplier: undecuple
    Germanic collective: elevensome
    Greek or Latinate collective: hendecad
    Greek collective prefix: hendeca-
    Latinate collective prefix: undeca-
    Fractional: eleventh
    Number of musicians: undecet

Etymology

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From eleven +‎ -some.

Noun

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elevensome (plural elevensomes)

  1. A group of eleven persons or things.
  NODES
Note 1