Santa Claus

n. fictional character associated with Christmas, character who brings children gifts on Christmas

Santa Claus, also known as Saint Nicholas, Father Christmas, Kris Kringle, or simply "Santa" is a legendary and historical character associated with bringing gifts on Christmas Day. The popular North American form Santa Claus originated as a mispronunciation of Dutch Sinterklaas, which in turn is a contracted form of Sint Nicolaas (Saint Nicholas). However, the Dutch Sinterklaas is different from Santa Claus in many ways: see the section on Dutch folklore. The Dutch word for Santa Claus is Kerstman ("Christmas man"). Santa Claus has a suit that comes in many colors depending on the country. The most common depiction (red with white sleeves, collar, and belt) became the more popular image in the United States in the mid-to-late 19th century.
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Noun
1. the legendary patron saint of children
(synonym) Kriss Kringle, Father Christmas, Saint Nick, St. Nick
(hypernym) patron saint

[Folklore] Father Christmas; the Christmas gift-bringer represented as a fat, jolly old man who drives a sleigh pulled by reindeer. He is identified with Saint Nicholas, the patron of children, and his name is a corruption of the Dutch name of the saint, Sint Nikolaas (Sinterklaas)

= Father Christmas, Santa Claus
Ex: This is when children are not really concerned with scientific truth; they believe in Father Christmas anyway, even if there lurks the suspicion that there is something rather fishy about it all. Ex: This is the world of fancies, Santa Claus, 'human' animals like Winnie-the-Pooh and Peter Rabbit, and Daleks and is often shown by the way in which a young child is able to carry on a sustained relationship with an imaginary friend or animal.