two-third

two-third (uncountable)

1. Rare form of two-thirds.

   a two-third majority

• “([two - third of*100), two-thirds of]”, in Google Books Ngram Viewer, (Can we date this quote?)
• “two-third of people, two-thirds of people”, in Google Books Ngram Viewer, (Can we date this quote?)
• “([two - third majority*50), two-thirds majority]”, in Google Books Ngram Viewer, (Can we date this quote?)