art.

1. 一
   He has got a job in Los Angeles.

   他已在洛杉矶找到一份工作。

2. 任一
   A triangle has three sides.

   三角形有三条边。

3. 某一
   A Mr. Brown wishes to see you.

   一位叫布朗的先生想见你。

4. 每一
   We met once a week.

   我们每周见面一次。

det.

1. used when mentioning someone or something for the first time; the indefinite article.
   ▸one single:

   a hundred.
   ▸used when mentioning someone unfamiliar:

   a Mr Smith telephoned.
   ▸someone like (the name specified).
2. in, to, or for each; per:
   petrol prices rose by 3p a litre.

abbrev.

1. (in travel timetables) arrives.
2. atto- (10^-18).
3. Brit. (with reference to sporting fixtures) away.
4. (used before a date) before. [from L. ante.]

symb.