WordReference Random House Unabridged Dictionary of American English © 2017
a for•ti•o•ri  (ä fōr′ti ōrē; Eng. ā fôr′shē ôrī, ā fōr′shē ōrī),USA pronunciation [Latin.]
  1. Foreign Termsfor a still stronger reason;
    even more certain;
    all the more.

Collins Concise English Dictionary © HarperCollins Publishers::

a fortiori /eɪ ˌfɔːtɪˈɔːraɪ -rɪ; ɑː/ adv
  1. for similar but more convincing reasons
Etymology: Latin


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