Webster's English Dictionary

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invocation

in.vo.ca.tion \.in-v*-'ka--sh*n-\ \-shn*l, -sh*n-*l\ n [ME invocacioun, fr. 
   MF invocation, fr. L invocation-, inv]ocatio, fr. invocatus, pp. of 
   invocare 1a: the act or process of petitioning for help or support : 
   SUPPLICATI ON; specif, often cap : an invocatory prayer (as at the 
   beginning of a service of worship) 1b: a calling upon for authority or 
   justification  2: a formula for conjuring : ENFORCEMENT  - in.vo.ca.tion.al 
   aj