From Middle English cristendom, cristendome, from Old English cristendōm, equivalent to Christen + -dom.

• IPA: /ˈkɹɪsn̩dəm/

Christendom

1. The Christian world; Christ#Proper noun's Church on Earth. [from 14th c.]
   • 1670, John Milton, “(please specify the page)”, in The History of Britain, that Part Especially now Call'd England. […], London: […] J[ohn] M[acock] for James Allestry, […] , →OCLC ↗:

     The Arian doctrine which then divided Christendom.

   • 2009, Diarmaid MacCulloch, A History of Christianity, Penguin, published 2010, page 503:

     Wessex was facing new barbarians, apparently intent on destroying everything that Christendom meant for England.

2. (now, rare) The state of being a (devout) Christian; Christian belief or faith. [from 9th c.]
   • c. 1596 (date written), William Shakespeare, “The Life and Death of King Iohn”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act IV, scene i], page 11 ↗, column 2:

     By my Chriſtendome, So I were out of priſon, and kept Sheepe, I ſhould be as merry as the day is long.

3. (obsolete) The name received at baptism; any name or appellation.
   • 1592, Thomas Nash[e], Pierce Penilesse His Supplication to the Deuill. […], London: […] [John Charlewood for] Richard Ihones, […], →OCLC ↗; republished as J[ohn] Payne Collier, editor, Pierce Penniless’s Supplication to the Devil. […], London: […] [Frederic Shoberl, Jun.] for the Shakespeare Society, 1842, →OCLC ↗, page 233 ↗:

     […] but for an Author to renounce his Chriſtendome to write in his owne commendation, to refuſe the name which his Godfathers and Godmothers gaue him in his baptiſme , and call himſelfe a wellwiller to both the writers […]

   • c. 1604–1605 (date written), William Shakespeare, “All's Well, that Ends Well”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act I, scene i], page 231 ↗, column 2:

     His faith, his ſweet diſaſter: with a world
     Of pretty fond adoptious chriſtendomes
     That blinking Cupid goſſips.

• Christ
• Christian
• Christianity

• French: chrétienté
• German: Christenheit, Christentum, Christenwelt
• Italian: cristianità
• Portuguese: cristandade
• Russian: христиа́нство
• Spanish: cristiandad