I would consider a goose to be the traditional meal. As that is what Charles Dickens mentions in "A Christmas Carol". As I recall a Christmas Goose is also mentioned in at least one of Sir Arthur Conan Doyle's "Sherlock Holmes" stories.
Very few eat goose at Xmas in the UK these days. As I recall, it's a bit pricey and factory farming of geese isn't that prevalent. Since the early 1900s, I think roast turkey became the more traditional dish. Supermarket freezers and chillers over here are full of turkeys when December rolls around.