"fifth" in the noun sense
a quantity of liquor equal to one fifth of a United States gallon
position five in a countable series of things
"he was fifth out of several hundred runners"
3. one-fifth, fifth, fifth part, twenty percent
one part in five equal parts
the musical interval between one note and another five notes away from it
"fifth" in the adjective sense
1. fifth, 5th
coming next after the fourth and just before the sixth in position
Source: WordNet® (An amazing lexical database of English)
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