1) Being one of 20 equal parts 2) Last century 3) Next after the nineteenth 4) Ordinal 1) Vigesimal 
• (a.) Next in order after the nineteenth; tenth after the tenth; coming after nineteen others; -- the ordinal of twenty. • (n.) The next in order after the nineteen; one coming after nineteen others. • (n.) The quotient of a unit divided by twenty; one of twenty equal parts of one whole. • (a.) Consisting, or being, one of twen...
[adj] - coming next after the nineteenth in position 2. [n] - position 20 in a countable series of things
20th adjective coming next after the nineteenth in position
next after the nineteenth; being the ordinal number for 20. · being one of 20 equal parts.