The Collaborative International Dictionary of English v.0.48:

Parlance \Par"lance\ (p[aum]r"lans), n. [OF., fr. F. parler to
   speak. See Parley.]
   Conversation; discourse; talk; diction; phrase; as, in legal
   parlance; in common parlance.
   [1913 Webster]

         A hate of gossip parlance and of sway.   --Tennyson.
   [1913 Webster] Parlando

WordNet (r) 3.0 (2006):

parlance
    n 1: a manner of speaking that is natural to native speakers of
         a language [syn: parlance, idiom]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "parlance":
   choice of words, composition, dialect, diction, expression,
   formulation, grammar, idiom, jargon, language, langue, lingo,
   lingua, locution, parole, personal usage, phrase, phraseology,
   phrasing, rhetoric, speech, talk, tongue, usage, use of words,
   usus loquendi, verbiage, wordage, wording



The Free On-line Dictionary of Computing (30 December 2018):

Parlance

   A concurrent language.

   ["Parallel Processing Structures: Languages, Schedules, and
   Performance Results", P.F. Reynolds, PhD Thesis, UT Austin
   1979].

   (1994-12-12)