Library / English Dictionary

21ST

 I. (adjective) 

Sense 1

Meaning:

Coming next after the twentieth in position

Synonyms:

21st; twenty-first

Classified under:

Adjectives

Similar:

ordinal (being or denoting a numerical order in a series)

Credits

 Context examples: 

Yellowfin tuna and skipjack tuna may shift their distribution eastward and poleward throughout the 21st century, with the potential disappearance of these species altogether from the western warm pool region.

(Pacific island fish migrating to cooler seas, SciDev.Net)

It was opened to add more mummies during the 21st Dynasty, about 3,000 years ago, to protect them during a period when tomb-robbing was common.

(Egypt Announces Discovery of 3,500-Year-Old Luxor Tomb, The Titi Tudorancea Bulletin)