conj.

1. 或者；还是
   Either you or I am to go.

   你我之间总有一个人要去。

   You may spend two or three days there.

   你可以在那里呆上两三天。

2. （用于否定句）也不
   Mary never skis or skates.

   玛丽从不滑雪，也不溜冰。

3. 否则，要不然
   Hurry up, or you'll be late.

   快点，否则你会迟到的。

4. 也就是说，换言之
   She studies biochemistry, or the science of life.

   她学生物化学，也就是生命科学。

conj.

1. used to link alternatives.
2. introducing a synonym or explanation of a preceding word or phrase.
3. otherwise.
4. archaic either.

n.

1. a logical operation which gives the value one if at least one operand has the value one, and otherwise gives a value of zero.
2. [as modifier] Electronics  denoting a gate circuit which produces an output if there is a signal on any of its inputs.

n.