Teachers, especially private ones who work with individual students or small groups to help them learn a subject.
From Latin 'tutor' (guardian, protector), derived from 'tutari' (to protect). Originally meant a legal guardian, but shifted to 'teacher' by the 1500s as the protective role extended to intellectual growth.
The word still carries its protective meaning—tutors 'guard' your understanding, protecting you from ignorance. Latin perfectly captured the idea that teaching and caring for someone are almost the same thing.
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