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Definition of Side effect
1. Noun. A secondary and usually adverse effect of a drug or therapy. "Severe headaches are one of the side effects of the drug"
2. Noun. Any adverse and unwanted secondary effect. "A strategy to contain the fallout from the accounting scandal"
Definition of Side effect
1. Noun. (idiomatic) An unintended consequence of any action in addition to the intended consequence of that action. ¹
2. Noun. (idiomatic medicine) An adverse effect, an unintended consequence of a drug or therapy; usually not a beneficial effect. ¹
3. Noun. (computing) A change in state caused by a function call (typically "side-effect"). ¹
¹ Source: wiktionary.com
Medical Definition of Side effect
1.