A person who shares the responsibility of teaching or tutoring another person alongside another tutor.
From Latin co- (together) + tutor (one who guards or teaches). The co- prefix indicates shared or joint action, a common way English creates new words from existing ones.
The prefix 'co-' is one of the most productive word-builders in English—it can combine with hundreds of words to instantly create a 'shared version,' which is why we have coauthors, copilots, and coworkers, all following the same ancient Roman pattern.
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