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Meaning of immersionism

im•mer•sion•ism

Pronunciation: (i-mûr'zhu-niz"um, -shu-), [key]
— n.
  1. the doctrine that immersion is essential to Christian baptism.
  2. the practice of baptism by immersion.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.