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]

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

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)