Coming next after the twentieth in a series.(adjective)
Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)
Use "21st" in a sentence
"The former tank commander has dismissed the opposition as "oligarchs" and "US imperialist lackeys" who take orders from Washington and plan to destroy the advances of what he terms a "21st century socialist revolution"."
"The largest city in the 21st is the state capital of New York, Albany."
"But Chávez's supporters fear Capriles could tap frustration over crime, inflation and crumbling infrastructure to topple what they call a "21st century socialist revolution"."