sixtieth
adjective
next after the fifty-ninth; being the ordinal number for 60.
The grammatical form denoting more than one person, place, thing, or idea.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
In fact they may be depended on almost to minutes of arc, i.e. to sixtieths of a degree.
From Pioneers of Science by Sir Oliver Lodge