fraction - the quotient of two rational numbers

half, one-half - one of two equal parts of a divisible whole; "half a loaf"; "half an hour"; "a century and one half"

one-third, third, tierce - one of three equal parts of a divisible whole; "it contains approximately a third of the minimum daily requirement"

two-thirds - two of three equal parts of a divisible whole

fourth part, one-fourth, quarter, quartern, twenty-five percent, fourth - one of four equal parts; "a quarter of a pound"

three-fourths - three of four equal parts; "three-fourths of a pound"

fifth part, one-fifth, twenty percent, fifth - a fifth part

one-sixth, sixth - a sixth part

one-seventh, seventh - a seventh part

one-eighth, eighth - an eighth part

one-ninth, ninth - a ninth part

one-tenth, ten percent, tenth, tenth part - a tenth part; one part in ten

one-sixtieth, sixtieth - one part in sixty

one percent, one-hundredth, hundredth - one part in a hundred

one-thousandth, thousandth - one part in a thousand

one-millionth, millionth - one part in a million

one-billionth, billionth - one part in a billion

one-trillionth, trillionth - one part in a trillion

one-quadrillionth, quadrillionth - one part in a quadrillion

one-quintillionth, quintillionth - one part in a quintillion