Present in or produced by nature: a natural pearl. Of, relating to, or concerning nature: a natural environment. Conforming to the usual or ordinary course of nature: a natural death. Not acquired; inherent: Love of power is natural to some people. Having a particular character by nature: a natural leader. Biology Not produced or changed artificially; not conditioned: natural immunity; a natural reflex. Characterized by spontaneity and freedom from artificiality, affectation, or inhibitions. See Synonyms at naive. Not altered, treated, or disguised: natural coloring; natural produce. Faithfully representing nature or life. Expected and accepted: "In Willie's mind marriage remained the natural and logical sequence to love\u201d ( Duff Cooper). Established by moral certainty or conviction: natural rights. Being in a state regarded as primitive, uncivilized, or unregenerate. Related by blood: the natural parents of the child. Born of unwed parents: a natural child. Mathematics Of or relating to positive integers, sometimes including zero. Music Not sharped or flatted. Music Having no sharps or flats. One having all the qualifications necessary for success: You are a natural for this job. One suited by nature for a certain purpose or function: She is a natural at mathematics. Music The sign (\u266e) placed before a note to cancel a preceding sharp or flat. Music A note so affected. A yellowish gray to pale orange yellow. Games A combination in certain card and dice games that wins immediately. An Afro hairstyle.