I. (ˈ)sek|sajənerē, -ri adjective
Etymology: Latin sexagenarius containing or consisting of sixty, from sexageni sixty each (from sexaginta sixty, irregular — influence of quadraginta forty — from sex six + -ginta — akin to Latin -ginti in viginti twenty) + -arius -ary — more at quadragesimal , six , vicenary
1. : of, relating to, or based on the number 60
2. : sexagenarian
II. noun
( -es )
1. : sexagesimal
2. : sexagenarian