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Adjective: sixty-fourth
  1. The ordinal number of sixty-four in counting order
    - 64th
Noun: sixty-fourth
  1. One part in sixty-four equal parts
    "In imperial measurements, one-sixty-fourth of an inch is a common unit";
    - one-sixty-fourth

Derived forms: sixty-fourths

See also: ordinal

Type of: common fraction, simple fraction, vulgar fraction [Brit]