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Ordinal {‑th}
Ordinal {‑th} is an English suffix, specifically an adjective suffix, that is used for ordinal numbers.
It is used in the following ordinal numbers, plus compounds based on them: fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh, thirteenth, fourteenth, fifteenth, sixteenth, seventeenth, eighteenth, nineteenth, twentieth, thirtieth, fortieth, fiftieth, sixtieth, seventieth, eightieth, ninetieth, hundredth, thousandth, millionth, billionth, trillionth (etc).
However, it is not used in the numbers first, second, third or their compounds.
Adjectives thus formed can be zero-nominalised to nouns, e.g. the fourth, the fifth, the sixth, etc.
