The Collaborative International Dictionary of English v.0.48:
Vaishnavism \Vaish"na*vism\, n. The worship of Vishnu. [1913 Webster]WordNet (r) 3.0 (2006):
Vaishnavism n 1: Hindu sect worshiping of Vishnu [syn: Vaishnavism, Vaisnavism] 2: worship of Vishnu one of the 3 chief gods of the Hindu pantheon [syn: Vaishnavism, Vaisnavism, Vishnuism]