British English present participle of baptise; the act of performing or undergoing the Christian sacrament of baptism.
British spelling of 'baptizing,' from Latin 'baptizāre' and Greek 'baptizein'; the '-ing' suffix forms the present participle.
The 's' versus 'z' distinction in English is geographical and historical—Americans standardized on 'z' while British English kept the older 's' from Latin roots.
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