cloister UK /ˈklɔɪstə/US /ˈklɔɪstɚ/verb 5noun 5forms 3 verb5 •To confine in a cloister, voluntarily or not. •To deliberately withdraw from worldly things. •To protect or isolate.Unique condo cloistered on top of hill. — 1983 •To provide with a cloister or cloisters.The architect cloistered the college just like the monastery which founded it. •To become a Roman Catholic religious. noun5 •A covered walk with an open colonnade on one side, running along the walls of buildings that surround a quadrangle. •such an arcade in a monastery; •such an arcade fitted with representations of the stages of Christ's Passion. •A place, especially a monastery or convent, devoted to religious seclusion. •(figurative) The monastic life. formscloistered · cloistering · cloisters