Natural  —adj. 1 a existing in or caused by nature (natural landscape). B uncultivated (in its natural state). 2 in the course of nature (died of natural causes). 3 not surprising; to be expected (natural for her to be upset). 4 unaffected, spontaneous. 5 innate (natural talent for music). 6 not disguised or altered (as by make-up etc.). 7 likely or suited by its or their nature to be such (natural enemies; natural leader). 8 physically existing (the natural world). 9 illegitimate. 10 mus. (of a note) not sharpened or flattened (b natural). —n. 1 colloq. (usu. Foll. By for) person or thing naturally suitable, adept, etc. 2 mus. A sign denoting a return to natural pitch. B natural note.  naturalness n. [latin: related to *nature]