Fiftieth
来自Big Physics
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wiktionary
From Middle English fiftythe, fyftith; equivalent to fifty + -eth.
etymonline
fiftieth (adj., n.)
"next in order after the forty-ninth; an ordinal numeral; being one of fifty equal parts into which a whole is regarded as divided;" Old English fifteogoða "fiftieth;" see fifty + -th (1). Compare Old Norse fimmtugande, and, with a different suffix, Old Frisian fiftichsta, Dutch vijftigste, Old High German fimfzugsto, German fünfzigste.
