n.

1. 授權；批准[U]
   He had no warrant for his action.

   他無權那麼做。

2. 【律】授權令；逮捕狀；搜查令[C]
   The police must obtain a warrant from a judge in order to search a house.

   警察必須從法官處取得搜查令才可搜查房子。

3. （正當）理由，根據[U][（+for）]
   He had no warrant for his suspicion.

   他沒有理由那麼懷疑。

4. 委任書；委託書；證書；憑單[C]
   Have you got a warrant of fitness for your car?

   你有沒有一張汽車合格證書？

5. 證明；保證；諾言[U]

vt.

1. 授權給；批准
2. 使有（正當）理由，成為……的根據[+v-ing]
3. 向……保證，保證（貨物）的品質；擔保[O8][O5][+（that）]
   The storekeeper warranted the goods as of the first quality.

   店主保證貨物品質第一。

4. 【口】斷言，敢說[+（that）]

n.

1. an official authorization enabling the police or some other body to make an arrest, search premises, etc.
2. a document entitling the holder to receive goods, money, or services.
3. Finance  a negotiable security allowing the holder to buy shares at a specified price at or before some future date.
4. justification or authority.
5. an official certificate of appointment issued to an officer of lower rank than a commissioned officer.

v.

1. justify or necessitate.
2. officially affirm or guarantee.