Fifth
WordNet
adjective
(1) Coming next after the fourth and just before the sixth in position
noun
(2) The musical interval between one note and another five notes away from it
(3) A quantity of liquor equal to one fifth of a United States gallon
(4) One part in five equal parts
(5) Position five in a countable series of things
"He was fifth out of several hundred runners"
WiktionaryText
Usage notes
In the UK the latter pronunciation is typically confined to lazy informal speech. In the United States it is a feature of some urban and African American dialects. The first pronunciation is both standard and vastly more common in both regions.