Etymology
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Christmas (n.)

"Church festival observed annually in memory of the birth of Christ," late Old English Cristes mæsse, from Christ (and retaining the original vowel sound) + mass (n.2).

Written as one word from mid-14c. As a verb, "to celebrate Christmas," from 1590s. Father Christmas is attested in a carol attributed to Richard Smart, Rector of Plymtree (Devon) from 1435-77. Christmas-tree in the modern sense is attested by 1835 in American English, rendering German Weihnachtsbaum. Christmas cards were first designed in 1843, popular by 1860s; the phrase Christmas-card was in use by 1850. Christmas present is from 1769. Christmas Eve is Middle English Cristenmesse Even (c. 1300).

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Christmas-tide (n.)

also Christmastide, "period from Christmas Eve to Epiphany," 1620s, from Christmas + tide (n.).

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Christmassy (adj.)

"characteristic of or suitable for Christmas," 1852, from Christmas + -y (2).

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*ghrei- 

ghrēi-, Proto-Indo-European root meaning "to rub." 

It forms all or part of: chrism; Christ; christen; Christian; Christmas; cream; grime; grisly; Kriss Kringle.

It is the hypothetical source of/evidence for its existence is provided by: Greek khriein "to anoint, besmear;" Lithuanian grieju, grieti "to skim the cream off;" Old English grima "mask, helmet, ghost," Middle Low German greme "dirt."

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Boxing Day (n.)
1809, "first weekday after Christmas," on which by an English custom postmen, employees, and others can expect to receive a Christmas present; originally in reference to the custom of distributing the contents of the Christmas box, which was placed in the church for charity collections. See box (n.1). The custom is older than the phrase.
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Noel (n.)

late 14c., nowel, nouel "Christmas, the Feast of the Nativity," from Old French noel "the Christmas season," variant of nael, from Latin natalis (dies) "birth (day)," used in Church Latin in reference to the birthday of Christ, from natus, past participle of nasci "be born" (Old Latin gnasci), from PIE root *gene- "give birth, beget." The modern word in English, with the sense "a Christmas carol" (1811) probably is a separate borrowing from French. As a masc. proper name, it is from Old French, probably literally "of or born on Christmas."

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Good Friday (n.)
the Friday before Easter, c. 1300, from good (adj.) in Middle English sense of "holy, sacred," especially of holy days or seasons observed by the church; the word also was applied to Christmas and Shrove Tuesday. Good Twelfthe Dai (c. 1500) was Epiphany (the twelfth day after Christmas).
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Xmas (n.)
"Christmas," 1551, X'temmas, wherein the X is an abbreviation for Christ in Christmas, English letter X being identical in form (but not sound signification) to Greek chi, the first letter of Greek Christos "Christ" (see Christ). The earlier way to abbreviate the word in English was Xp- or Xr- (corresponding to the "Chr-" in Greek Χριστος), and the form Xres mæsse for "Christmas" appears in the "Anglo-Saxon Chronicle" (c. 1100).
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figgy (adj.)

also figgey, 1540s "sweet" (as figs are), from fig (n.1) + -y (2). From 1846 (in a book of Cornish words) as "full of figs or raisins." The figgy pudding of the Christmas carol is a dish of dried figs stewed in wine that dates back to the Middle Ages but was more often associated with Lent than Christmas.

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nativity (n.)

early 12c., Nativite, "feast-day celebrating the birth of Christ, Christmas," from Old French nativité "birth, origin, descent; birthday; Christmas" (12c.), from Late Latin nativitatem (nominative nativitas) "birth," from Latin nativus "born, native" (see native (adj.)). Late Old English had nativiteð, from earlier Old French nativited. From late 14c. as "fact of being born; circumstances attending one's birth."

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