baptism

/ˈbæptɪzəm/
noun
  1. 1

    A Christian sacrament, by which one is received into a church and sometimes given a name, generally involving the candidate to be anointed with or submerged in water.

  2. 2

    A similar ceremony of initiation, purification or naming.

Source: https://en.wiktionary.org/wiki/baptism