Noah Webster's New International Dictionary of the English Language

1. (conj.) A particle which expresses the relation of connection or addition. It is used to conjoin a word with a word, a clause with a clause, or a sentence with a sentence.

2. (conj.) In order to; -- used instead of the infinitival to, especially after try, come, go.

3. (conj.) It is sometimes, in old songs, a mere expletive.

4. (conj.) If; though. See An, conj.