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In page Baptism:

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The English word baptism is derived indirectly through Latin from the neuter Greek concept noun báptisma (Greek βάπτισμα, 'washing, dipping'),[1][2] which is a neologism in the New Testament derived from the masculine Greek noun baptismós (βαπτισμός), a term for ritual washing in Greek language texts of Hellenistic Judaism during the Second Temple period, such as the Septuagint.[3][4] Both of these nouns are derived from the verb baptízō (βαπτίζω, 'I wash' transitive verb), which is used in Jewish texts for ritual washing,[citation needed] and in the New Testament both for ritual washing and also for the apparently new rite of báptisma.