The Collaborative International Dictionary
Sixty-fourth \Six`ty-fourth"\, a. Constituting or being one of sixty-four equal parts into which a thing is divided.
Sixty-fourth note (Mus.), the sixty-fourth part of a whole note; a hemi-demi-semiquaver.
Wiktionary
n. (context fractional English) One of sixty-four equal parts of a whole. num. (context ordinal English) The ordinal form of the number sixty-four, describing a person or thing in position number 64 of a sequence.
Usage examples of "sixty-fourth".
Nigel Trentham chose Charlie's sixty-fourth birthday to announce to the world that he would be making a full bid for Trumper's shares at a price of two pound four shillings, a mere six weeks before he was enticed to lay claim to his inheritance.
As during these labours I have advanced pretty far in years (this very month, into my sixty-fourth year), I must be careful in spending my time, if I am to carry out my plan, of furnishing a metaphysic of nature, and a metaphysic of morals, in confirmation of the truth of my critique both of speculative and of practical reason, and must leave the elucidation of such obscurities as could at first be hardly avoided in such a work, and likewise the defence of the whole, to those excellent men who have made it their own.