To sprinkle or pour water over, or to immerse in water, as a spiritual cleansing process in the rite of Christian baptism.(verb)
To dedicate or christen.(verb)
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Use "baptise" in a sentence
"Love which was implied in Christ's engagement to "baptise" all His followers "with fire," and the services should above all else, be such as would ensure the immediate conversion to God of all who came under their influence."
"How do you "baptise" someone who ain't there to be baptised."
"If I gave them enough alcohol, I'll bet I could get some to .. er .. "baptise" themselves in the names of others."