'Reasoner' definitions:

Definition of 'reasoner'

From: WordNet
noun
Someone who reasons logically [syn: reasoner, ratiocinator]

Definition of 'Reasoner'

From: GCIDE
  • Reasoner \Rea"son*er\ (r[=e]"z'n*[~e]r), n. One who reasons or argues; as, a fair reasoner; a close reasoner; a logical reasoner. [1913 Webster]