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]

The Free On-line Dictionary of Computing (19 January 2023):

Parlance

   A concurrent language.

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

   (1994-12-12)