What is Romance?

According to Webster's Dictionary, the word romance has these meanings:
1 a (1): a medieval tale based on legend, chivalric love and adventure, or the supernatural (2): a prose narrative treating imaginary characters involved in events remote in time or place and usually heroic, adventurous, or mysterious (3): a love story especially in the form of a novel b: a class of such literature2: something (as an extravagant story or account) that lacks basis in fact3: an emotional attraction or aura belonging to an especially heroic era, adventure, or activity4: love affair 5capitalized : the Romance languages

I, however, think that the word "Romance" has different meanings to different people in different circumstances. For instance, a movie that contains great love of two people is usually considered a romance movie. But, would it still be considered romance if this great love is broken apart by a great tragedy? Think Titanic. (Sorry, a little spoiler here... ) Rose and Jack never had much a chance before the ship sunk. Kate had a great life post sunken ship incident, got married, had a couple of kids (none of them were Jack's), but Jack was fish food. Yeah, I cried half the movie. I couldn't help but feel sadness and sorrow coming out of the theater. IMDB.com list this movie as Romance. Some of my friends that I have spoken to also think it is a romantic movie. Do I consider this movie a romance? I can't really say so. It's just too tragic. When I finish a "Romance" movie or book, I really hope to feel euphoria, a sense of well-being. I can believe again that great love can succeed and not die with a premature death. So, yes! I would like Romance to have happy endings, where the hero and heroine have the possibility to have a good long life in the future. If not, what is the sense of make-believe!