a person who is skilled in logic.

1350–1400; logic + -ian; replacing Middle English logicien < Middle French

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World English Dictionary
logician (lɒˈdʒɪʃən)
a person who specializes in or is skilled at logic

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., from Fr. logicien (see logic).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Confirmation bias is not only nothing new, in a properly trained logician, it
  can be avoided.
Maybe even a logician would benefit from some formal training in science before
  presuming to pontificate about how to do it.
As any logician could testify, however, these premises have no necessary
  relationship to their conclusion.
His father was a logician and a philosopher of science.
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