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twenty years old
I will turn twenty years old next year.
(inorganic chemistry) carbon dioxide
Carbon dioxide is one of the main causes of global warming.
sulfur dioxide
This factory is emitting a large amount of sulfur dioxide.
twelve o'clock; noon; midnight
I eat lunch at twelve o'clock.
(electronics) diode (rectifier tube)
This diode only allows current to flow in one direction.
twenty-one; 21
My younger sister is twenty-one years old.
(grammar) an abbreviation for 上二段活用; upper dual grade conjugation
The grammar of 'Jou-nidan' is an important part in learning Japanese.
(grammar) Short for 下二段活用 (shimo nidan katsuyō): lower bigrade conjugation
I hurried down the lower two steps.
a male given name
Kenjiro is my best friend.
Keijiro is my best friend.
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