To attend an event together or simultaneously with others; to be present at the same time and place.
Modern English prefix 'co-' (from Latin 'cum' meaning 'with') + 'attend' (from Latin 'attendere' meaning 'to direct one's mind'). This is a relatively recent formation in English.
The 'co-' prefix is becoming more productive in modern English—we now say 'coauthor,' 'cohost,' and 'coattend' to show shared responsibility or participation, reflecting how teamwork dominates modern life!
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