/twen"tee ith, twun"-/ , adj.
1. next after the nineteenth; being the ordinal number for 20.
2. being one of 20 equal parts.
n.
3. a twentieth part, esp. of one ( 1 / 20 ).
4. the twentieth member of a series.
[ bef. 900; ME twentithe, OE twentigotha. See TWENTY, -ETH 2 ]