Not in accordance with accepted standards, especially of morality or honesty. His improper behavior at the meeting was noted by everyone.
Not suitable or appropriate in the circumstances. Wearing jeans to the formal dinner was considered improper.
Not correct; inaccurate or erroneous. The improper calculation led to a significant error in the report.
Of a fraction, having a numerator that is greater than or equal to the denominator. An improper fraction such as 7/4 can be converted to a mixed number.
In mathematics, of an integral, having one or both limits infinite or an integrand that becomes infinite within the interval of integration. The improper integral ∫₁^∞ 1/x² dx converges to 1.