noun 1. childbirth involving little or no use of drugs or anesthesia and usually involving a program in which the mother is psychologically and physically prepared for the birth process. noun 1. a method of childbirth characterized by the absence of anaesthetics, in which the expectant mother is given special breathing and relaxing exercises natural […]
noun 1. death that occurs from natural causes, as disease or old age, rather than from violence or an accident.
- Natural deduction
noun 1. a system of formal logic that has no axioms but permits the assumption of premises of an argument. Such a system uses sequents to record which assumptions are operative at any stage Compare axiomatic (sense 3) logic A set of rules expressing how valid proofs may be constructed in predicate logic. In the […]
- Natural disaster
noun any event or force of nature that has catastrophic consequences, such as avalanche, earthquake, flood, forest fire, hurricane, lightning, tornado, tsunami, and volcanic eruption