a.

1. 自然的；有关自然界的
   We visited a museum of natural history.

   我们参观了一个自然博物馆。

2. 天然的
   Coal and oil are natural products.

   煤和石油是天然物产。

3. 不做作的
   Try to look natural for your photograph.

   拍照要尽量显得自然一些。

4. 物质的，非精神的
   the natural world

   物质世界

5. 合乎常情的；正常的
   It's only natural that you should be nervous.

   你感到紧张是很自然的。

6. 天生的；天赋的[B]
   Cats have a natural aversion to water.

   猫天生厌水。

7. 自然状态的，蒙昧的；未开垦的
8. 逼真的
9. 私生的[Z][B]
10. 生身的[Z][B]
11. 【音】还原的；标明本位号的[A]

n.[C]

1. 天然物；自然的事情
2. 【婉】白痴
3. 【口】生就具有特定才能的人
   He is a natural on the piano.

   他天生擅长弹钢琴。

4. 【口】自然成功的事
5. 【音】本位音；还原号

adj.

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.

n.

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.