Webster's English Dictionary

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invoke

in.voke \in-'vo-k\ vt [ME invoken, fr. MF invoquer, fr. L invocare, fr. in- 
   +] vocare to call - more at VOICE 1a: to petition for help or support  1b: 
   to appeal to or cite as authority  2: to call forth by incantation : 
   CONJURE  3: to make an earnest request for : SOLICIT {invoked their  
   forgiveness} 4: to put into effect or operation : IMPLEMENT  5: to bring 
   about : CAUSE  - in.vok.er n