a fortiori

from WordNet (r) 3.0 (2006)
a fortiori
    adv 1: with greater reason; for a still stronger, more certain
           reason; "if you are wrong then, a fortiori, so am I"
from The Collaborative International Dictionary of English v.0.48
A fortiori \A for`ti*o"ri\ [L.] (Logic & Math.)
   With stronger reason.
   [1913 Webster]
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