Definition of and :
1. 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. If; though. See An, conj.
3. In order to; - used instead of the infinitival to, especially after try, come, go.
4. It is sometimes, in old songs, a mere expletive.
also (part of speech: adverb)