a numerical quantity that is not a whole number (e.g. 1/2, 0.5)

a small or tiny part, amount, or proportion of something

he hesitated for a fraction of a second

her eyes widened a fraction

each of the portions into which a mixture may be separated according to a physical property such as boiling point or solubility

the third fraction contain alcohols with boiling points of 120–130°C

(in the Christian Church) the breaking of the Eucharistic bread

the Fraction may be accompanied by the Agnus Dei