Pronunciation: (frak'shun),[key] —n. 1. Math. a. a number usually expressed in the form a/b. b. a ratio of algebraic quantities similarly expressed.
2. Chem.(in a volatile mixture) a component whose range of boiling point temperatures allows it to be separated from other components by fractionation.
3. a part as distinct from the whole of anything; portion or section: The meeting started with a fraction of us present. 4. a very small part or segment of anything; minute portion: Only a fraction of the work was completed on time. 5. a very small amount; a little bit: It was only a fraction away from completion. 6. a piece broken off; fragment or bit.
7. the act of breaking.
8. Eccles.(in a Eucharistic service) the breaking of the Host.
—v.t., v.i. to divide or break into fractions, sections, factions, etc.: Dissension threatens to fraction the powerful union.