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trial and error an empirical method of solving a problem by trying out a variety of means and rejecting those that result in error.
trial balance in double-entry bookkeeping, a statement of all open debit and credit balances, usu. made to test their equality before a final statement is issued.
trial balloon any tentative action, statement, policy, or program that is released to test public opinion before a final version is put into effect. [2 definitions]
trial jury see "petit jury."