When capitalized, Noel refers to Christmas or the Christmas season. Uncapitalized, noel refers to a Christmas carol.

// We were greeted at the door by a group of carolers singing noels.

// Every year we send our family Christmas cards with our photo enclosed wishing everyone a joyous Noel.

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“The meeting began with a touch of holiday spirit as members of the Woodland Park High School Madrigals sang three selections. The first was a Noel song with a medieval/renaissance feel that was well matched to their festive costumes. They followed with the popular ‘Carol of the Bells’ and ‘We Wish You a Merry Christmas.’” — Doug Fitzgerald, The Pikes Peak (Colorado) Courier, 9 Dec. 2024

English speakers borrowed noel from the French word noël, which is also used for both the Christmas holiday and a Christmas carol. It can be traced further back to the Latin word natalis, which can mean “birthday” as a noun or “of or relating to birth” as an adjective. (The English adjective natal has the same meaning and is also an offspring of natalis.) Noels were being sung in Latin and French for centuries before English-speakers started using the word to refer to Christmas carols in the 18th century. An early use of noel (spelled Nowel) to mean “Christmas” can be found in the text of the late 14th-century Arthurian legend Sir Gawain and the Green Knight.