frac ‧ tion /ˈfrækʃ ə n/ BrE AmE noun [countable]
[ Date: 1300-1400 ; Language: Late Latin ; Origin: fractio , from Latin fractus , past participle of frangere 'to break' ]
1 . a very small amount of something
I got these shoes at a fraction of the original price.
She paused for a fraction of a second.
2 . a part of a whole number in mathematics, such as ½ or ¾