conj.

1. 或者；還是
   Either you or I am to go.

   你我之間總有一個人要去。

   You may spend two or three days there.

   你可以在那裡待上兩三天。

2. （用於否定句）也不
   Mary never skis or skates.

   瑪麗從不滑雪，也不溜冰。

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

   快點，否則你會遲到的。

4. 也就是說，換言之
   She studies biochemistry, or the science of life.

   她學生物化學，也就是生命科學。

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.