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fraction
/ˈfrækʃən/
noun
plural
fractions
plural
fractions
Learner's definition of FRACTION
[count]
1
mathematics
:
a number (such as ¹/₂ or ³/₄) which indicates that one number is being divided by another
also
:
a number (such as 3.323) that consists of a whole number and a decimal
2
:
a part or amount of something

a fraction of an inch/second

We've described only a small fraction [=portion] of the available options.

The new program will provide similar benefits at a fraction of the cost (of the old one). [=at much less cost; for much less money]

We can now do the job in a fraction of the time. [=in much less time]