n.

1. 患病[U]
   Mother was worried that there would be nobody around in the event of a sudden attack of sickness.

   媽媽擔心患急病時身邊沒人。

2. 疾病[C]
   My aunt knows all about this sickness.

   我姨媽對這種疾病了如指掌。

3. 噁心，嘔吐[U]
   Some women experience morning sickness during the first trimester of pregnancy.

   有些婦女在懷孕的頭三個月裡，早上有噁心感。

n.

1. the state of being ill.
   ▸a particular type of illness or disease.
2. nausea or vomiting.