trial-and-error

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WordNet Dictionary
	Definition:		[n]  experimenting until a solution is found [adj]  trying out various means or theories until error is satisfactorily reduced or eliminated; "he argued that all learning is a trial-and-error process that resembles biological evolution" [adj]  relating to solving problems by experience rather than theory; "they adopted a trial-and-error procedure"
	Synonyms:		empirical, heuristic
	See Also:		experiment, experimentation