1 expel (a supposed evil spirit) by invocation or by use of a holy name.
2 (often foll. by of) free (a person or place) of a supposed evil spirit.
Derivatives:
exorcism n. exorcist n. exorcization n.
Etymology: F exorciser or eccl.L exorcizare f. Gk exorkizo (as EX-(2), horkos oath)
Useful english dictionary. 2012.