The Collaborative International Dictionary of English v.0.48:

Feasible \Fea"si*ble\ (f[=e]"z[i^]*b'l) a. [F. faisable, fr.
   faire to make or do, fr. L. facere. See Fact, Feat.]
   1. Capable of being done, executed, or effected; practicable.
      [1913 Webster]

            Always existing before their eyes as a thing
            feasible in practice.                 --Burke.
      [1913 Webster]

            It was not feasible to gratify so many ambitions.
                                                  --Beaconsfield.
      [1913 Webster]

   2. Fit to be used or tilled, as land. [R.] --R. Trumbull.
      Fea"si*ble*ness, n. --Fea"si*bly, adv.
      [1913 Webster]

WordNet (r) 3.0 (2006):

feasible
    adj 1: capable of being done with means at hand and
           circumstances as they are [syn: feasible, executable,
           practicable, viable, workable]

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "feasible":
   achievable, actable, adaptable, advantageous, advisable,
   applicable, appropriate, attainable, banausic, becoming, befitting,
   beneficial, compassable, congruous, convenient, decent, desirable,
   doable, ductile, effective, effectual, efficient, expedient,
   favorable, felicitous, fit, fitten, fitting, flexible, foolproof,
   fructuous, good, handy, happy, likely, malleable, manageable,
   maneuverable, meet, negotiable, operable, opportune, overcomable,
   performable, pliable, pliant, politic, possible, practicable,
   practical, pragmatic, profitable, proper, realistic, realizable,
   recommendable, right, seasonable, seemly, sensible, sortable,
   suitable, superable, surmountable, timely, to be desired,
   tractable, untroublesome, usable, useful, viable, well-timed,
   wieldable, wieldy, wise, workable, worthwhile, yielding



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

feasible

    A description of an algorithm that takes
   polynomial time (that is, for a problem set of size N, the
   resources required to solve the problem can be expressed as
   some polynomial involving N).

   Problems that are "feasible" are said to be "in P" where P is
   polynomial time.  Problems that are "possible" but not
   "feasible" are said to be "in NP".

   (2001-04-12)

    A description of a project or system for
   which a feasibility study gives a positive answer.

   (2006-07-11)