All these words are applied to that which is usual or expected because it conforms to a standard or rule. Normal implies that a particular person or thing does not exceed certain limits, or does not deviate far from an average or a standard established for a group, class or species.

• Normal body temperature ranges between 96.8 and 98.6 Fahrenheit; Normal temperature in Sydney in June is about 55 .

Regular implies accordance with some rule, plan or method: to follow regular army procedures.

Typical indicates possession of those properties or characteristics that distinguish a particular class of things from all other classes of things: the typical clubbed antennae of the butterfly. This word is not always used with accuracy and may designate what is expected or usual, even if not absolutely certain: Such bragging is typical of his behaviour. Ordinary , as an equivalent for normal or regular, emphasizes commonness or usualness and often stresses the absence of superior qualities.

• An ordinary man is no genius; Ordinary ways of doing things keep within the rules but do not initiate improvements.

Natural emphasizes the agreement between an action and the innate character of the agent involved. Thus it is natural for man to seek happiness, for birds to migrate, for the sun to set.