1RRC a Christian religious ceremony in which someone is touched or covered with water to welcome them into the Christian faith, and sometimes to officially name them [↪ christening]
2 a difficult or painful first experience of something :
The campaign has been a baptism of fire.
baptism of/by fire
The campaign has been a baptism of fire. —baptismal
adjective [only before noun]
a baptismal font (=container for holding the water used at baptism)
adjective [only before noun]
a baptismal font (=container for holding the water used at baptism)