LATIN DICTIONARYLexicon Latīnum
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“christianity” in Latin

The English word christianity itself goes back to Latin Chrīstus, through christianus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

christianity
religio Christiana (Eutropius): *doctrina Christi or Christiana: cultus Christianus (the worship): *sacra Christiana (the service, especially consideres as sacrificial): *sensus Christianus: pietas, with or without Christiana (the piety or religious sense of a true Christian).

Quick answer

What is the Latin word for christianity?
The usual Latin words for “christianity” are pietās, Eutropius, Chrīstiānus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.