As a Noun: 1. A Christian ceremony in which a baby is made a member of the Christian church by being anointed with water and is officially given his or her name. English = christening, (Catholic) baptism. As a Verb or Adjective: 1. Of a baby, to be made a member of the Christian church by being anointed with water and to be officially given his or her name. English = (be) christened, (Catholic) (be) baptised.