The Collaborative International Dictionary of English v.0.48:
Lutheranism \Lu"ther*an*ism\, Lutherism \Lu"ther*ism\, n. The doctrines taught by Luther or held by the Lutheran Church. [1913 Webster]WordNet (r) 3.0 (2006):
Lutheranism n 1: teachings of Martin Luther emphasizing the cardinal doctrine of justification by faith alone