GNU Collaborative International Dictionary of English

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1.       
   Efforce , v. t. [imp. & p. p. Efforced ; p. pr. & vb. n. Efforcing .] [OF. esforcier (F. s'efforcer to exert one's self), LL. exforciare; L. ex + fortis strong. See Force.] To force; to constrain; to compel to yield. [Obs.]
   Spenser.
   
   1913 Webster