Ordinal. The way to remember it is that it pertains to things in order in a series.
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"One" is a cardinal number, while "first" is an ordinal number.
Ordinal numbers suggest order such as first, second, third etc. Cardinal numbers are counting numbers. One, two, three, etc.
Cardinal numbers are one, two, three, four, ... Ordinal numbers are first, second, third, fourth, ...
Thirty first.
The major quantitative adjectives are the cardinal and ordinal numbers: one, two, three, .... and first, second, third, ... respectively.