fifth
‘next in order after the fourth; an ordinal numeral; being one of five equal parts into which a whole is regarded as divided’
Lexical development traced from Tamil root:
E. fifðe, fyueȝt, fyueþe, fyfthe < O.E. fifta ‘fifth’< Proto-G. finftan- < fimfe ‘five' + -tha < fif < penkwe- < Tamil aintu