A part or portion of a whole amount: Mr. Long stared at the girl just a fraction of a moment before turning away.

A fraction whose numerator (top number) is the same as or larger than the denominator (bottom number): As an example in in music, an improper fraction can be exemplified by 3/2, meaning that there are 3 beats or counts to one measure (top number) and each beat has the value of a half note (bottom number).

A fraction in which the numerator is smaller than the denominator: In math class, Mr. Sub told the students that a proper fraction could be 2/4 or 2/3, for example.