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Definition of Oneth
1. Adjective. ''(archaic or nonstandard)'' 'first', or other ordinal derivatives of 'one', such as ''hundred-and-oneth'' or ''minus-oneth'' ¹
2. Noun. (in compounds with ''twenty-, thirty-, forty-'', etc.) A fractional part of an integer ending in one ¹
¹ Source: wiktionary.com