Meaning of ordinal

[Salman]

English Error, Elementary Level

ESL/EFL Test #2 "Be careful", question 6

I am really not interesting in mobile phones as I prefer ordinary phones.

(a) interesting in
(b) as
(c) ordinary

English Error, Elementary Level

ESL/EFL Test #2 "Be careful", answer 6

I am really not interested in mobile phones as I prefer ordinary phones.

Correct entry: interested in
The error was: (a) interesting in
_________________________

meaning of ordinal, please.

Salman

[Conchita]

Ordinal refers to a number indicating the position in a series: 1, 2 and 20 are cardinal numbers, 1st, 2nd and 20th are all ordinals/ordinal numbers.