What does "fraction" mean?

Additional senses

1. 2.(Arith. or Alg.) One or more aliquot parts of a unit or whole number; an expression for a definite portion of a unit or magnitude. Common, or Vulgar, fraction, a fraction in which the number of equal parts into which the integer is supposed to be divided is indicated by figures or letters, called the denominator, written below a line, over which is the numerator, indicating the number of these parts included in the fraction; as -- Complex fraction, a fraction having a fraction or mixed number in the numerator or denominator, or in both. Davies & Peck. -- Compound fraction, a fraction of a fraction; two or more fractions connected by of. -- Continued fraction, Decimal fraction, Partial fraction, etc. See under Continued, Decimal, Partial, etc. -- Improper fraction, a fraction in which the numerator is greater than the denominator. -- Proper fraction, a fraction in which the numerator is less than the denominator.
2. 3.To separate by means of, or to subject to, fractional distillation or crystallization; to fractionate; -- frequently used with out; as, to fraction out a certain grade of oil from pretroleum.