Ninety

[nahyn-tee] /ˈnaɪn ti/

noun, plural nineties.
1.
a cardinal number, ten times nine.
2.
a symbol for this number, as 90 or XC.
3.
a set of this many persons or things.
4.
nineties, the numbers, years, degrees, or the like, from 90 through 99, as in referring to numbered streets, indicating the years of a lifetime or of a century, or degrees of temperature:
His grandmother is in her nineties.
adjective
5.
amounting to 90 in number.
/ˈnaɪntɪ/
noun (pl) -ties
1.
the cardinal number that is the product of ten and nine See also number (sense 1)
2.
a numeral, 90, XC, etc, representing this number
3.
something represented by, representing, or consisting of 90 units
determiner
4.

Old English nigontig, from nine + -tig “group of ten” (see -ty (1)). Cognate with Old Frisian niontich, Middle Dutch negentich, Dutch negentig, German neunzig.

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Ninety-day wonder
[nahyn-tee-dey] /ˈnaɪn tiˌdeɪ/ noun, Informal. 1. an officer commissioned in a branch of the armed forces after an unusually short training period, especially after a three-months officers’ training course during World War II. noun phrase [WWI armed forces; based on nine-days’ wonder]
Ninety-eight
[nahyn-tee-eyt] /ˈnaɪn tiˈeɪt/ noun 1. a cardinal number, 90 plus 8. 2. a symbol for this number, as 98 or XCVIII. 3. a set of this many persons or things. adjective 4. amounting to 98 in number.
Ninety-eighth
[nahyn-tee-eytth, -eyth] /ˈnaɪn tiˈeɪtθ, -ˈeɪθ/ adjective 1. next after the ninety-seventh; being the ordinal number for 98. 2. being one of 98 equal parts. noun 3. a ninety-eighth part, especially of one (1/98). 4. the ninety-eighth member of a series.

Ninety-fifth
[nahyn-tee-fifth] /ˈnaɪn tiˈfɪfθ/ adjective 1. next after the ninety-fourth; being the ordinal number for 95. 2. being one of 95 equal parts. noun 3. a ninety-fifth part, especially of one (1/95). 4. the ninety-fifth member of a series.
Ninety-first
[nahyn-tee-furst] /ˈnaɪn tiˈfɜrst/ adjective 1. next after the ninetieth; being the ordinal number for 91. 2. being one of 91 equal parts. noun 3. a ninety-first part, especially of one (1/91). 4. the ninety-first member of a series.