1. One of twenty equal parts.

2. The ordinal of twenty.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• twenthieth,
• twientieth,
• twentyth,
• twenthith,
• twentiesth,
• twenieth,
• twentie,
• twethieth,
• twentieh,
• twentyeth,
• twentienth,
• twentyith,
• twentith,
• twenith,
• twentyieth,
• twenteeth,
• twententh,
• twetieth,
• twantieth,
• tentirti

• twenty-two,
• twenty-third,
• twenty-three.

The adjective form of the word "twentieth" is "twentieth".

The plural form of the word "twentieth" is "twentieths"

The singular form of the word "twentieth" is "twentieth".