natural

Concise Oxford English Dictionary © 2008 Oxford University Press:
natural/ˈnatʃrəl/

▶adjective

• 1 existing in or derived from nature; not made, caused by, or processed by humans.

  ■ having had a minimum of processing or preservative treatment.

  ■ (of fabric) unbleached and undyed; off-white.

• 2 in accordance with nature; normal.

  ■ relaxed and unaffected.

  ■ inevitable: the natural choice.

  ■ (of law or justice) based on innate moral sense.

• 3 (of a parent or child) related by blood.

  ■ chiefly archaic illegitimate.

• 4 Music (of a note) not sharpened or flattened.

  ■ (of a brass instrument) having no valves and able to play only the notes of the harmonic series above a fundamental note.

  ■ relating to the notes and intervals of the harmonic series.

• 5 Christian Theology relating to human or physical nature as distinct from the spiritual or supernatural realm.

• 6 Bridge (of a bid) straightforwardly reflecting one's holding of cards. Often contrasted with conventional or artificial.

▶noun

• 1 a person with an innate gift or talent for a particular task or activity.

• 2 Music a natural note, or a sign (♮) denoting one when a previous sign or the key signature would otherwise demand a sharp or a flat.

  ■ any of the longer, lower keys on a keyboard instrument that are normally white.

• 3 an off-white colour.

• 4 a hand of cards, throw of dice, or other result which wins immediately.

• 5 Fishing an insect or other small creature used as bait, rather than an artificial imitation.

• 6 archaic a person born with impaired intelligence.

– derivatives
naturalness noun.