sixty-oneth /ˌsɪksti ˈwʌnθ/adjective 1noun 1forms 1 adjective1 •(nonstandard) sixty-first noun1 •A fractional part of sixty-oneWith an area of 3367 square miles [Corsica] is only a sixty-oneth of the area of France and four thirty-thirds of that of Italy. — 1899 formssixty-oneths
