noun
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the opposition, resistance offered by one thing, force, etc., to another.
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the act or power of resisting, opposing or withstanding.
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the act of cooperating; joint effort or operation; co-operation; collaboration.
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a returning like for like, esp. evil for evil, injury for injury, etc.; retaliation.
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anything that is used in treating a disease, healing, reliving pain, etc.; a medicine.