Natural rock climbing walls. Definition of natural adjective in Oxford Advanced Learner's Dictionary. in accordance with human nature: it is only natural to want to be liked. While all these words mean "being of the sort or kind that is expected as usual, ordinary, or average," natural applies to what conforms to a thing's essential nature, function, or mode of being. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. as is normal or to be expected; ordinary or logical: the natural course of events. Some common synonyms of natural are normal, regular, and typical. natural implies lacking artificiality and self-consciousness and having a spontaneousness suggesting the natural rather than the man-made world. The basic properties that these ranks must have is . The basic properties that these ranks must have is natural, ingenuous, naive, unsophisticated, artless mean free from pretension or calculation. 4.