a cardinal number, 60 plus 4.
a symbol for this number, as 64 or LXIV.
a set of this many persons or things.
amounting to 64 in number.


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  • Sixty-fourmo

    [siks-tee-fawr-moh, -fohr-] /ˌsɪks tiˈfɔr moʊ, -ˈfoʊr-/ noun, plural sixty-fourmos. 1. a book size (about 2 × 3 inches; 5 × 7 cm) determined by printing on sheets folded to form 64 leaves or 128 pages. 2. a book of this size. Symbol: 64mo, 64°. adjective 3. printed, folded, or bound in sixty-fourmo. sixty-fourmo /ˌsɪkstɪˈfɔːməʊ/ noun […]

  • Sixty-fourth

    [siks-tee-fawrth, -fohrth] /ˈsɪks tiˈfɔrθ, -ˈfoʊrθ/ adjective 1. next after the sixty-third; being the ordinal number for 64. 2. being one of 64 equal parts. noun 3. a sixty-fourth part, especially of one (1/64). 4. the sixty-fourth member of a series.

  • Sixty-fourth note

    noun, Music. 1. a note having one sixty-fourth of the time value of a whole note; hemidemisemiquaver. sixty-fourth note noun 1. (music, US & Canadian) a note having the time value of one sixty-fourth of a semibreve Also called (in Britain and certain other countries) hemidemisemiquaver

  • Sixty-four thousand dollar question

    noun 1. a crucial question or issue

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