Etymology
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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.

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Definitions of fortieth
1
fortieth (n.)
position 40 in a countable series of things;
2
fortieth (adj.)
the ordinal number of forty in counting order;
Synonyms: th
From wordnet.princeton.edu