1º_ Group that shares some characteristic and allows to group it by it. 2º_ By the previous one it is called 'class' in taxonomy to which it groups orders in animals and plants. 3º_ By the first, it is said especially to the group of students, and by extension to each subject they study, to the lesson that is taught to them, to their classroom, in general to the educational activity in institutes. 4º_ It is common to use 'class' as 'distinguished class, upper class' to qualify something elegant.
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