classification · noun C or U /ˌklæs.ə.fəˈkeɪ.ʃən/Full view
C2 the process of putting people or things into groups by their type, size, etc., or one of these groups
Dictionary example:

the classification of plants

Learner example:

Cinema attendance between 1990 and the present, with projections to 2010, is reported with the classification of four age groups: (i) 14-24 years old (ii) 25-34 years old (iii) 35-49 years old (iv) over 50 years old respectively. (International English Language Testing System; C1; Chinese)

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