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Language: Old English
Origin: seofontiene, from seofon 'seven' + tien 'ten'

seventeen

number
     
sev‧en‧teen
the number 17:
a group of seventeen American military officers
I left home when I was seventeen (=17 years old).
seventeenth adjective, pronoun:
in the seventeenth century
her seventeenth birthday
I'm planning to leave on the seventeenth (=the 17th day of the month).

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