·- A form of the prefix in- not, and in- in. ·see In-. Im- also occurs in composition with some words not of Latin origin; as, imbank, imbitter.
im, i. q. eum, v. is init. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
·- A contraction of I am. ...
Webster's Dictionary of the English Language