IPA: /ˈsɪkstiəθ/
KK: /ˈsɪkstiəθ/
A term used to describe one part of sixty equal parts or the position of sixty in a sequence.
She finished in her sixtieth year, celebrating a life full of adventures.
Sixtieth is formed from "six" (from Old English "siex", meaning the number 6) and "-tieth" (a suffix used to denote ordinal numbers, meaning the position in a sequence). The word "sixtieth" refers to the ordinal position of 60 in a sequence.
Think of the number 'six' and remember that 'sixtieth' means the position of 60th in a sequence.