Noun
five-sixths (uncountable)
Five of six equal parts (5/6, ⅚, 0.8333…).
five-sixths of the population
five-sixths
Examples include the strings corresponding to one-third (010101…), five-sixths (11010101…) and five-eighths (1010000…). Source: Internet
In 1700, five-sixths of the world's coal was mined in Britain. Source: Internet