n.

1. 單位；單元[C]
   The hour is a unit of time.

   小時是時間單位。

   The family is a social unit.

   家庭是一個社會單元。

2. （全體中的）一個，一員[C]
   We regard husband and wife as the primary units of the family.

   我們把夫妻視為家庭的基本成員。

3. （設備等的）一套，一組；裝置[C]
   I'm thinking of buying a hi-fi unit.

   我正在考慮買一套高保真音響設備。

4. （常構成複合詞）組合件，組件[C]
   There is something wrong with the power unit of my computer.

   我電腦的電源出了毛病。

5. 組，分隊；部隊[C][G]
   Small guerilla units were fighting behind enemy lines.

   游擊小分隊在敵人後方作戰。

6. 【數】最小整數；個位數[C]
7. 【美】教學單元[C]

n.

1. an individual thing or person regarded as single and complete but also able to form a individual component of a larger whole.
   ▸a self-contained section of a building or group of buildings.
   ▸a subdivision of a larger military grouping.
   ▸a self-contained part of an educational course.
   ▸a single manufactured item.
2. a device or part with a specified function.
3. a standard quantity in terms of which other quantities may be expressed.
4. one as a number or quantity.