(1):
(conj.) In order to; - used instead of the infinitival to, especially after try, come, go.
(2):
(conj.) It is sometimes, in old songs, a mere expletive.
(3):
(conj.) If; though. See An, conj.
(4):
(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.