Adverb

1. By force.
   • 1593 — William Shakespeare, Richard III, Act iii, scene 1 (First Folio)

     If ſhe denie, Lord Hastings goe with him,
     And from her iealous Armes pluck him perforce.

2. Necessarily.
   • 2006 — Alejandro Portes, Rubén G. Rumbaut, Immigrant America: A Portrait, 3rd ed., page 239

     Adult immigrants must perforce learn some English, and their children are likely to become English monolinguals.