Corrected, set right, or improved after being wrong or faulty; in chemistry, purified by distillation.
From Latin 'rectus' (right, straight) + '-ify' (to make). The word originally meant 'to make right or straight,' later applied to correcting errors and purifying substances.
In electronics and chemistry, 'rectify' has very specific meanings—a rectifier converts alternating current to direct current, literally 'straightening' the electrical current's direction!
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