ADJ

large, significant, sizeable, substantial
mere, small, tiny
A mere fraction of available wind energy is currently utilized

PREP

~ of
Why not grow your own fruit at a fraction of the price?

PHRASES

just/only a fraction
The average income is high, though many people earn just a fraction of that average

ADJ

vulgar
decimal
improper
11/8 is an improper fraction, equivalent to one and three-eighths

VERB + FRACTION

express sth as
Express 25% as a fraction