The cardinal number occurring after eighty-nine and before ninety-one, represented in Roman numerals as XC and in Arabic numerals as 90.

(software engineering) A humorous aphorism stating that the first 90% of the code accounts for the first 90% of the development time, and the remaining 10% of the code accounts for the other 90% of the development time.

Alternative letter-case form of nineties, in the context of a specific decade (almost always) the 1890s or 1990s.

plural of ninety / The decade of the 1890s, 1990s, etc. / The decade of one's life from age 90 through age 99. / (temperature, rates, plural only) The range between 90 and 99.

From or evoking the 91st through 100th years of a century (chiefly the 1990s).

plural of ninety-ninth

The ordinal form of the number ninety-two, describing a person or thing in position number 92 of a sequence.

One of ninety-two equal parts of a whole.

The ordinal form of the number ninety-eight, describing a person or thing in position number 98 of a sequence.

One of ninety-eight equal parts of a whole.