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test, trial, pilot, preliminary, provisional, tentative, speculative, innovative, new, original, radical, creative, ingenious, avant-garde, inventive
The root word of "experimental" is "experiment," which comes from the Latin word "experimentum," meaning a test or trial.
It is a small trial survey to test the quality of the questionnaire for a larger survey.
Society of Experimental Test Pilots was created in 1955.
things that you change every trial