班主任

teacher in charge of a class

surname Ban

team / class / squad / work shift / ranking / CL:個|个[ge4] / classifier for groups of people and scheduled transport vehicles

leader of a theatrical troupe

owner / master / host / individual or party concerned / God / Lord / main / to indicate or signify / trump card (in card games)

director / head / CL:個|个[ge4]

surname Ren / Ren County 任縣|任县[Ren2 Xian4] in Hebei

to assign / to appoint / to take up a post / office / responsibility / to let / to allow / to give free rein to / no matter (how, what etc) / classifier for terms served in office, or for spouses, girlfriends etc (as in 前任男友)