number ordinal
The term 'número ordinal' in Spanish translates to 'ordinal number' in English. Ordinal numbers are words representing position or rank in a sequential order. The order may be of size, importance, chronology, and so on. In English, we use ordinal numbers to denote position in a list (first, second, third, etc.). In Spanish, 'primero, segundo, tercero' and so forth, are used in a similar manner.
I am the eighth president of this company.
The ordinal number 'octavo' is used here to indicate order in a sequence of presidents of the company.
I live in the third house on the right.
The ordinal number 'tercera' is used here to describe the position of the house in relation to others on a street.
Today is my first day working here.
The ordinal number 'primer' is used here to indicate the start or beginning of something, in this case, a job.