The Collaborative International Dictionary of English v.0.48:
Literatim \Lit`e*ra"tim\ (l[i^]t`[-e]*r[aum]"t[i^]m), adv. [LL., fr. L. littera, litera, letter.] Letter for letter. [1913 Webster]WordNet (r) 3.0 (2006):
literatim adv 1: letter for letter; "the message was transcribed literatim"