n.[C]

1. 部分；部門；切片，斷片
   The company dominates this segment of the market.

   該公司控制了這一部分市場。

2. 【數】線段；弓形；球缺
3. 【語】語流中的一個音素（或單個音）
4. 【生】體節，節
   The sacrum has five segments fused together into one large bone.

   薦椎是由五塊椎骨融合成一塊大骨頭。

5. 【電腦】數據段，程式段

vt.

1. 分割，切割

vi.

1. 分割成部分；切成片（或段等）

n.

1. each of the parts into which something is or may be divided.
2. Geometry  a part of a circle cut off by a chord, or a part of a sphere cut off by a plane not passing through the centre.
3. Phonetics  the smallest distinct part of a spoken utterance, especially with regard to vowel and consonant sounds.
4. Zoology  each of a series of similar anatomical units of which the body and appendages of some animals are composed.

v.

1. divide into segments.
2. Embryology  (of a cell) undergo cleavage.