(US) The decade of the 1890s, characterised by decadence, social scandal, and the beginning of the suffragette movement.

(UK) Synonym of Gay Nineties (the 1890s)

The cardinal number occurring after nine thousand nine hundred and ninety-eight and before ten thousand, represented in Arabic numerals as 9,999. Represented in Roman numerals as IXCMXCIX.

A genius depends more on hard work than imagination.

(informal) Approximately ninety / (informal) Of about ninety years of age.

By a factor of ninety.

By a factor of ninety.

plural of ninetysomething

(colloquial) An indeterminate value between 90 (inclusive) and 100 (exclusive).

(colloquial) A person between 90 and 99 years old.