ordinal number

名词 ordinal number:

1. the number designating place in an ordered sequence
   同义词：ordinal, no.

1. The ordinal number matching the number19 in a series.
   第十九在数列中与数字19相配的序数词
2. The ordinal number matching the number one trillion in a series.
   第一万亿，第一兆可数数列中与一万亿相对应的序数
3. The ordinal number matching the number15 in a series.
   第十五在一系列中排在第十五的序数