| sixty | (n) the cardinal number that is the product of ten and six, Syn. 60, LX |
| sixty | (adj) being ten more than fifty, Syn. lx, 60, threescore |
| sixty-eight | (adj) being eight more than sixty, Syn. lxviii, 68 |
| sixty-fifth | (adj) the ordinal number of sixty-five in counting order, Syn. 65th |
| sixty-five | (adj) being five more than sixty, Syn. lxv, 65 |
| sixty-four | (adj) being four more than sixty, Syn. 64, lxiv |
| sixty-fourth | (adj) the ordinal number of sixty-four in counting order, Syn. 64th |
| sixty-fourth note | (n) a musical note having the time value of a sixty-fourth of a whole note, Syn. hemidemisemiquaver |
| sixty-nine | (adj) being nine more than sixty, Syn. ilxx, 69 |
| sixty-one | (adj) being one more than sixty, Syn. 61, lxi |