Vine's Expository Dictionary of NT Words 
"a thought, reasoning, inward questioning" [akin to dialogizomai, see Reason (Verb), No. 1], is translated "reasoning" or "reasonings" in Luke 5:22 , RV (AV, "thoughts"); Luke 9:46; Luke 9:47 , RV (AV, "thoughts"); 24:38 (AV, "thoughts"); Romans 1:21 (AV, "imaginations"); 1—Corinthians 3:20 (AV, "thoughts"). See Dispute , A, No. 1.
King James Dictionary 
RE'ASONING, ppr. arguing deducing inferences from premises debating discussing.
RE'ASONING, n. The act or process of exercising the faculty of reason that act or operation of the mind by which new or unknown propositions are deduced from previous ones which are known and evident, or which are admitted or supposed for the sake of argument argumentation ratiocination as fair reasoning false reasoning absurd reasoning strong or weak reasoning. The reasonings of the advocate appeared to the court conclusive.
Webster's Dictionary 
(1): ( n.) The act or process of adducing a reason or reasons; manner of presenting one's reasons.
(2): ( n.) That which is offered in argument; proofs or reasons when arranged and developed; course of argument.
(3): ( p. pr. & vb. n.) of Reason