sexagenary ( synonym found)
Definition of sexagenary:

°of or pertaining to the number sixty; composed of, or proceeding by sixties.
°sexagenarian.
°sexagesimal.
°sexagenarian.
Definition of sexagenary:

°of or pertaining to the number sixty; composed of, or proceeding by sixties.
°sexagenarian.
°sexagesimal.
°sexagenarian.
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