The Collaborative International Dictionary of English v.0.48:

Gest \Gest\, n. [OF. geste exploit. See Jest.]
   [1913 Webster]
   1. Something done or achieved; a deed or an action; an
      adventure. [Obs.] --Chaucer.
      [1913 Webster]

   2. An action represented in sports, plays, or on the stage;
      show; ceremony. [Obs.] --Mede.
      [1913 Webster]

   3. A tale of achievements or adventures; a stock story.
      [Obs.] --Chaucer. Spenser.
      [1913 Webster]

   4. Gesture; bearing; deportment. [Archaic]
      [1913 Webster]

            Through his heroic grace and honorable gest.
                                                  --Spenser.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gest \Gest\, n. [Cf. Gist a resting place.]
   [1913 Webster]
   1. A stage in traveling; a stop for rest or lodging in a
      journey or progress; a rest. [Obs.] --Kersey.
      [1913 Webster]

   2. A roll recting the several stages arranged for a royal
      progress. Many of them are extant in the herald's office.
      [Obs.] --Hanmer.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gest \Gest\, n.
   A guest. [Obs.] --Chaucer.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "gest":
   Marchen, Western, Western story, Westerner, accomplished fact,
   accomplishment, achievement, act, acta, action, adventure,
   adventure story, allegory, apologue, aristeia, bedtime story, blow,
   bold stroke, coup, dealings, deed, detective story, doing, doings,
   effort, emprise, endeavor, enterprise, exploit, fable, fabliau,
   fairy tale, fait accompli, fantasy, feat, fiction, folk story,
   folktale, ghost story, go, hand, handiwork, heroic act,
   horse opera, job, legend, love story, maneuver, measure, move,
   mystery, mystery story, myth, mythology, mythos, nursery tale,
   operation, overt act, parable, passage, performance, proceeding,
   production, res gestae, romance, science fiction, shocker,
   space fiction, space opera, step, stroke, stunt, suspense story,
   thing, thing done, thriller, tour de force, transaction, turn,
   undertaking, venture, whodunit, work, work of fiction, works



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

Generic Expert System Tool
GEST

    (GEST) An expert system shell for
   Symbolics Lisp machine, with frames, forward chaining,
   backward chaining and fuzzy logic; written by John
   Gilmore(?) at GA Tech.

   (ftp://ftp.gatech.edu/pub/ai/gest.tar.Z).

   (1995-04-16)