Friends or companions who attend the same school.
Compound of 'school' (from Greek 'skhole' meaning 'leisure' or 'place of learning') and 'mate' (from Middle Low German 'mate' meaning 'messmate'). Combined in English around the 16th century.
The word 'school' originally meant 'leisure time'—because in ancient Greece, school was a luxury only for the wealthy who had time not to work! Your schoolmates shared that privilege with you.
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