The Collaborative International Dictionary of English v.0.48:

Cogent \Co"gent\, a. [L. cogens, p. pr. of cogere to drive
   together, to force; co- + agere to drive. See Agent, a.,
   and cf. Coact to force, Coagulate, p. a.]
   1. Compelling, in a physical sense; powerful. [Obs.]
      [1913 Webster]

            The cogent force of nature.           --Prior.
      [1913 Webster]

   2. Having the power to compel conviction or move the will;
      constraining; conclusive; forcible; powerful; not easily
      reasisted.
      [1913 Webster]

            No better nor more cogent reason.     --Dr. H. More.
      [1913 Webster]

            Proofs of the most cogent description. --Tyndall.
      [1913 Webster]

            The tongue whose strains were cogent as commands,
            Revered at home, and felt in foreign lands.
                                                  --Cowper.

   Syn: Forcible; powerful; potent; urgent; strong; persuasive;
        convincing; conclusive; influential.
        [1913 Webster]

WordNet (r) 3.0 (2006):

cogent
    adj 1: powerfully persuasive; "a cogent argument"; "a telling
           presentation"; "a weighty argument" [syn: cogent,
           telling, weighty]

Moby Thesaurus II by Grady Ward, 1.0:

127 Moby Thesaurus words for "cogent":
   acute, admissible, advantageous, apperceptive, appercipient,
   argute, armipotent, astute, auspicious, authoritative, beneficial,
   benevolent, binding, bon, bonny, braw, bueno, capital, commendable,
   compelling, consequential, consistent, constraining, convincing,
   credible, discerning, dynamic, effective, elegant, energetic,
   estimable, excellent, expedient, fair, famous, farseeing,
   farsighted, favorable, fine, forceful, forcible, foreseeing,
   foresighted, forethoughted, forethoughtful, good, goodly, grand,
   healthy, helpful, high-potency, high-powered, high-pressure,
   high-tension, in force, in power, incisive, inducing, influential,
   irresistible, just, justifiable, justified, kind, laudable, lawful,
   legal, legitimate, logical, longheaded, longsighted, meaningful,
   mighty, mighty in battle, momentous, nice, noble, operative,
   penetrating, perceptive, percipient, perspicacious, perspicuous,
   persuasive, piercing, plausible, pleasant, potent, powerful,
   prepotent, profitable, provident, puissant, rational, reasonable,
   regal, royal, ruling, sagacious, sane, satisfactory, satisfying,
   self-consistent, sensible, significant, skillful, solid, sound,
   splendid, striking, strong, substantial, sufficient, telling,
   trenchant, understanding, useful, valid, very good, vigorous,
   virtuous, vital, weighty, well-argued, well-founded, well-grounded,
   wholesome



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

COmpiler and GENeralized Translator
COGENT

    (COGENT) A compiler writing language with
   pattern-directed string and list processing features, for CDC
   3600 and CDC 3800.  A COGENT program consists of
   productions defining a context-free language, plus
   analysis and synthesis function generators.

   ["COGENT Programming Manual", J.C. Reynolds, ANL-7022, Argonne,
   Mar 1965].

   [Sammet 1969, p.638].

   ["An Introduction to the COGENT System", J.C. Reynolds, Proc
   ACM 20th Natl Conf, 1965].

   (1994-12-23)