Why is the ninth month called September?
mid-15c., "protection, care, custody," from Anglo-French tuycioun (late 13c.), from Old French tuicion "guardianship," from Latin tuitionem (nominative tuitio) "a looking after, defense, guardianship," from tuitus, past participle of tueri "to look after" (see tutor). Meaning "action or business of teaching pupils" is recorded from 1580s. The meaning "money paid for instruction" (1828) is probably short for tuition fees, in which tuition refers to the act of teaching and instruction.