Twen"ti*eth (?), a. [From Twenty; cf. AS. twentigoa. See Twenty.]
1.
Next in order after the nineteenth; tenth after the tenth; coming after nineteen others; -- the ordinal of twenty.
2.
Consisting, or being, one of twenty equal parts into which anything is divided.
© Webster 1913.
Twen"ti*eth, n.
1.
The next in order after the nineteen; one coming after nineteen others.
2.
The quotient of a unit divided by twenty; one of twenty equal parts of one whole.
© Webster 1913.