(physics, chemistry) An apparatus for the separation of the volatile components of a liquid by means of fractional distillation, sometimes accompanied by selective adsorption

(mathematics, arithmetic) Any fraction in which either or both of the numerator or denominator are themselves fractions.

(mathematics, arithmetic) A fraction in which both the numerator and the denominator consist of whole numbers.

(chemistry) The fractional proportion of a substance in a mixture, by weight/mass.

A method of separating a mixture of liquids that have different boiling points

(cartography) The scale of a map expressed as a fraction. For example, 1/63,360 or 1:63,360 indicates a scale of one inch to the mile.

(mathematics) A vulgar fraction whose denominator is a power of two, or a rational number representable as such a fraction.

(mathematical analysis, uncountable) The branch of mathematics that studies generalisations of calculus to allow noninteger (i.e., real or complex) powers of the differentiation operator D and the integration operator J; (countable) any one of said generalisations of calculus.

(mathematics) A fraction which reduces to the form 0/0 for a particular value of the variable which enters it, usually in consequence of the existence of a common factor in both terms of the fraction, which factor becomes 0 for this particular value of the variable.

(process engineering, chemistry) A process used to separate substances with different melting points.