Crossword Genius

Number used to denote the position in an ordered sequence (7)

Ross

I believe the answer is:

ordinal

(Other definitions for ordinal that I've seen before include "Ranking number" , "Kind of number defining position in series" , "RC Church service book" , "(Of numbers) first or second, perhaps" , "Number which shows position in a series" .)

I've seen this clue in The Mirror.
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