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(obsolete) To appropriate; to limit.
(obsolete) To behave improperly.
From Middle French impropre, from Latin improprius (“not proper”), from in- + proprius (“proper”).
Here she was, thinking improper thoughts again.
She has nearly finished Colburn's mental arithmetic, her last work being in improper fractions.
He said improper things to me.
It would be quite improper for Assembly to tell any of our churches how to 'be ' and'do ' church.
A fractional number is called a proper fraction or an improper fraction according as the numerator is or is not 3 less than the denominator; and an expression 4 such as 24 is called a mixed number.
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