WordReference Random House Unabridged Dictionary of American English © 2025
im•mer•sion•ism
(i mûr′zhə niz′əm, -shə-),USA pronunciation n.
im•mer′sion•ist, n.
- Religionthe doctrine that immersion is essential to Christian baptism.
- Religionthe practice of baptism by immersion.
- immersion + -ism 1835–45