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Christmas (literally, the Mass of Christ) is a holiday in
  the Christian calendar, usually observed on December 25, which celebrates the
  birth of Jesus. 
Christmas allowance - Christmas bonus  
Christmas cake - a rich fruitcake (usually covered with icing and
  marzipan) and eaten at Christmas  
Christmas card - a greetings card that people send to friends and
  family at Christmas  
Christmas carol - a song whose lyrics are on the theme of Christmas,
  or the winter season in general  
Christmas cracker - consists of a cardboard tube wrapped in a brightly
  decorated twist of paper (making it resemble an oversized sweet-wrapper). It
  is pulled by two people and much in the manner of a wishbone, the cracker
  splits unevenly. The split is accompanied by a small bang  
Christmas Day - a Christian holiday celebrating the birth of Christ,
  25 December  
Christmas Eve - the day before Christmas  
Christmas holidays - the holiday period for about a week before and
  after Christmas Day  
Christmas present - a present given at Christmas time  
Christmas stocking - a large sock which children leave out when they
  go to bed on Christmas Eve so that it can be filled with small presents  
Christmas pudding - plum pudding: a rich steamed or boiled pudding
  that resembles cake  
Christmas rose - European evergreen plant with white or purplish rose
  like winter-blooming flowers  
Christmas shopping - buying Christmas presents  
Christmas tree - an evergreen or artificial tree decorated, as with
  lights and ornaments, during the Christmas season  
Father Christmas - chiefly British - - Santa Claus  
Christmas tree ball - Christmas ball ornament  
white Christmas - a Christmas when it snows  
Merry Christmas! - said at Christmas to wish people a pleasant
  Christmas period  
 
 
Some expressions containing the word Christmas: 
 
Happy Christmas! Merry Christmas!  
 
When do you break up for Christmas?  
at Christmas  
for Christmas  
 
Now we put new vocabulary into context, so you can see how you might use
  these terms yourself. The expressions are in boldface in the text.  
 
Each of our employees who have been with our firm for a period of six months
  or more receives a Christmas bonus.  
The Christmas Cake as we know it today comes from two customs which
  became one around 1870 in Victorian England. Originally there was a porridge,
  the origins of which go back to the beginnings of Christianity. Then there
  was a fine cake made with the finest milled wheat flour, this was baked only
  in the Great Houses, as not many people had ovens back in the 14th century.  
Many businesses, particularly smaller local businesses, send Christmas
  cards to the people on their customer lists, as a way to develop general
  goodwill and reinforce social networks.  
Christmas carols can be sung by individual singers, but are also often
  sung by larger groups, including professionally trained choirs.  
Many Christians traditionally celebrate a midnight mass at midnight on Christmas
  Eve, which is held in churches throughout the world, marking the
  beginning of Christmas Day.  
Christmas pudding is the dessert traditionally served on Christmas day
  in Britain. It has its origins in England, and is sometimes known as plum
  pudding, though this can also refer to other kinds of boiled pudding
  involving a lot of dried fruit.  
The Christmas tree is normally an evergreen tree that is brought in
  the house or used in the open and is decorated with Christmas lights and colourful
  ornaments during the days around Christmas.  
 
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