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an oral beta blocker used in treating hypertension

Action; working; agency; exertion of power or influence; specifically, in psychology, the exertion of any mental power, especially an active power, Power exercised in producing an effect; peculiar efficacy of action; characteristic property or virtue, The method of working; mode of action

a wild and exciting undertaking (not necessarily lawful)

a material such as glass or porcelain with negligible electrical or thermal conductivity