The Collaborative International Dictionary of English v.0.48:

Discrete \Dis*crete"\, a. [L. discretus, p. p. of discernere.
   See Discreet.]
   1. Separate; distinct; disjunct. --Sir M. Hale.
      [1913 Webster]

   2. Disjunctive; containing a disjunctive or discretive
      clause; as, "I resign my life, but not my honor," is a
      discrete proposition.
      [1913 Webster]

   3. (Bot.) Separate; not coalescent; -- said of things usually
      coalescent.
      [1913 Webster]

   Discrete movement. See Concrete movement of the voice,
      under Concrete, a.

   Discrete proportion, proportion where the ratio of the
      means is different from that of either couplet; as,
      3:6::8:16, 3 bearing the same proportion to 6 as 8 does to
      16. But 3 is not to 6 as 6 to 8. It is thus opposed to
      continued or continual proportion; as, 3:6::12:24.

   Discrete quantity, that which must be divided into units,
      as number, and is opposed to continued quantity, as
      duration, or extension.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Discrete \Dis*crete"\, v. t.
   To separate. [Obs.] --Sir T. Browne.
   [1913 Webster]

WordNet (r) 3.0 (2006):

discrete
    adj 1: constituting a separate entity or part; "a government
           with three discrete divisions"; "on two distinct
           occasions" [syn: discrete, distinct]

Moby Thesaurus II by Grady Ward, 1.0:

149 Moby Thesaurus words for "discrete":
   alien, aloof, apart, assorted, asunder, at odds, at variance,
   bipartite, broadcast, broken, broken off, chopped-off, choppy,
   contrary, contrasted, contrasting, decousu, departing, detached,
   deviating, deviative, dichotomous, different, differentiated,
   differing, diffuse, disaccordant, disagreeing, disconnected,
   discontinued, discontinuous, discordant, discrepant, discriminated,
   disjoined, disjunct, disjunctive, disparate, dispersed, dispread,
   disrelated, disseminated, dissimilar, dissipated, dissociated,
   dissonant, distinct, distinguished, distributed, divergent,
   diverging, divers, diverse, diversified, episodic, exotic,
   extraneous, fitful, foreign, gapped, herky-jerky, heterogeneous,
   in disagreement, in two, inaccordant, incoherent, incommensurable,
   incomparable, incompatible, incongruous, inconsistent, inconsonant,
   independent, individual, inharmonious, insular, intermittent,
   interrupted, irreconcilable, irregular, irrelative, isolated,
   jagged, jerky, many, motley, multifarious, nonadherent,
   nonadhesive, noncoherent, noncohesive, noncontinuous, nonlinear,
   nonsequential, nonserial, nonuniform, open, other, outlandish,
   parenthetic, partitioned, patchy, poles apart, poles asunder,
   removed, scattered, scrappy, segregate, separate, separated,
   several, snatchy, sparse, spasmodic, sporadic, spotty, spread,
   straggling, straggly, strange, strewn, strown, suspended, tenuous,
   unadhesive, unaffiliated, unallied, unassociated, unattached,
   unattended, uncoherent, uncohesive, unconformable, unconnected,
   unequal, unjoined, unlike, unrelatable, unrelated, unsuccessive,
   untenacious, variant, varied, variegated, various, varying,
   widely apart, widespread, worlds apart



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

discrete

    A description of a quantity whose value is one
   of a fixed set of values, as opposed to a continuous - a
   value capable of infinitessimal variation.  For example,
   integers are discrete values whereas real numbers are
   continuous; digital sound has discrete amplitude leves
   whereas analog sound is continuous.

   (2009-10-08)