n.[U]

1. 【物】重力；引力；地心吸力
   The stone rolled down the hill by gravity.

   石頭在重力作用下向山下滾去。

2. 重（量）
3. 嚴重性；危險性；重大
   She does not know the gravity of her illness.

   她不知道自己病情嚴重。

4. 嚴肅；莊嚴；認真
   He could hardly keep his gravity.

   他忍不住要笑出來。

5. 低沉

n.

1. Physics  the force that attracts a body towards the centre of the earth, or towards any other physical body having mass.
   ▸the degree of intensity of this, measured by acceleration.
2. extreme importance; seriousness.
   ▸solemnity of manner.