The Collaborative International Dictionary of English v.0.48:

Test \Test\, v. t. [imp. & p. p. Tested; p. pr. & vb. n.
   Testing.]
   1. (Metal.) To refine, as gold or silver, in a test, or
      cupel; to subject to cupellation.
      [1913 Webster]

   2. To put to the proof; to prove the truth, genuineness, or
      quality of by experiment, or by some principle or
      standard; to try; as, to test the soundness of a
      principle; to test the validity of an argument.
      [1913 Webster]

            Experience is the surest standard by which to test
            the real tendency of the existing constitution.
                                                  --Washington.
      [1913 Webster]

   3. (Chem.) To examine or try, as by the use of some reagent;
      as, to test a solution by litmus paper.
      [1913 Webster]

   4. To administer a test[8] to (someone) for the purpose of
      ascertaining a person's knowledge or skill; especially, in
      academic settings, to determine how well a student has
      learned the subject matter of a course of instruction.
      [PJC]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Testing \Test"ing\, n.
   1. The act of testing or proving; trial; proof.
      [1913 Webster]

   2. (Metal.) The operation of refining gold or silver in a
      test, or cupel; cupellation.
      [1913 Webster]

   Testing machine (Engin.), a machine used in the
      determination of the strength of materials, as iron,
      stone, etc., and their behavior under strains of various
      kinds, as elongation, bending, crushing, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

testing
    n 1: the act of subjecting to experimental test in order to
         determine how well something works; "they agreed to end the
         testing of atomic weapons"
    2: an examination of the characteristics of something; "there
       are laboratories for commercial testing"; "it involved
       testing thousands of children for smallpox"
    3: the act of giving students or candidates a test (as by
       questions) to determine what they know or have learned [syn:
       examination, testing]

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "testing":
   R and D, analytic, control, control experiment,
   controlled experiment, cut and try, cut-and-try, empirical,
   empiricism, examinational, examinatorial, examining, experiment,
   experimental, experimental design, experimental method,
   experimental proof, experimentalism, experimentation,
   explorational, explorative, exploratory, fact-finding, feeling,
   groping, heuristic, hit and miss, hit-or-miss, indagative,
   inspectional, inspectorial, investigational, investigative,
   investigatory, noble experiment, pilot, pragmatism, probationary,
   probative, probatory, proving, provisional,
   research and development, rule of thumb, tentative,
   tentative method, tentativeness, test, trial, trial and error,
   trial-and-error, trying, verificatory, zetetic



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

test
testing

    The process of exercising a product to identify
   differences between expected and actual behaviour.  Typically
   testing is bottom-up: unit testing and integration testing
   by developers, system testing by testers, and user
   acceptance testing by users.

   Test coverage attempts to assess how complete a test has
   been.

   2. The second stage in a generate and test search
   algorithm.

   [Jargon File]

   (2003-09-24)