Fortieth
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wiktionary
From Middle English fourtithe, fourtiþe; equivalent to forty + -eth.
etymonline
fortieth (adj., n.)
"next in order after the thirty-ninth; an ordinal numeral; being one of forty equal parts into which a whole is regarded as divided;" c. 1200, fowertiþe, from Old English feowertigoða, from feowertig (see forty) + -th (1). Compare Old Norse fertugonde, Swedish fyrationde, Danish fyrretyvende.
