21st

21st is the ordinal form of the number 21. Twenty-first or 21st may also refer to:

• A fraction, 1⁄21, equal to one of 21 equal parts
• 21st of the month, a recurring calendar date
• 21st birthday, the age of majority in a several countries

Geography

• 21st meridian east, a line of longitude
• 21st meridian west, a line of longitude
• 21st parallel north, a circle of latitude
• 21st parallel south, a circle of latitude
• 21st Avenue
• 21st Street (disambiguation)

Military

• Twenty-First Air Force
• 21st Army (disambiguation)
• 21st Battalion (disambiguation)
• 21st Division (disambiguation)
• 21st Regiment (disambiguation)
• 21st Squadron (disambiguation)

Other

• Twenty-first Amendment (disambiguation)
  • Twenty-first Amendment to the United States Constitution
• 21st century
• 21st century BC

See also

• 21 (disambiguation)
• 21st Century (disambiguation)