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1.
the new age for a person who doesnt want to lose being a teenager once they hit the age of twenty!
tomorrow is my twenteenth birthday
by Andy Ogun September 13, 2005
77 15
 
2.
Essentially a replacement word for Twenty, however, this is more of a characteristic of defining the new "kidult" age. Which is the age from 18 - 25, where people are staying at home longer, in order to obtain an education without moving out. Also used for people who continue to be a teenager well after their age has exceded the teenage years. This covers the ages from 20, through to 29 (twenteen-nine), as the age of 30 becomes thirteen, which is going backwards.
I am currently twenteen (20) years of age. Actually, I am currently twenteen-two years of age. But that is so not the point.
by Justin Krueger June 17, 2005
37 17
 
3.
The age between nineteen and twenty-one. Twenteen is used when the birthday boy/ birthday girl is not excited about no longer being a teenager and feel like if they mask the age behind a false definition, the pain of getting old will lessen.
Much Younger Best Friend: "Hey Jordan, how old are you turning today?"
The Birthday Boy: "I'm only twenteen! Just a youngin'! I'm not ready to be old yet."
by Gordon Tusker-Deepfreeze July 12, 2008
19 9
 
4.
This current decade which spans from 2010 (twenty-ten) to 2019 (twenty-nineteen).

Twen (from twenty) plus teen.

It includes: 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 and finishing with 2019.
The movie Avatar is set to become one of the highest grossing titles of the twenteens.
by boc choi July 18, 2011
3 4