The term glamour was originally meant to be; a spell cast over someone, particularly to change how things appeared to them. The primary modern meaning of the word relates to fascination, charisma, beauty, or attraction.  Celebrities are often referenced as glamorous.  In addition to celebs being glamorous, regular every day people, or their lifestyles, can be described as glamorous.  Although many words which end in "our" in British English are spelled with "or" in American English, "glamour" is an exception with the "u" usually being retained.  This may be due to its original being Scottish rather than French or Latin.  The alternative spelling "glamour" is sometimes used in American English, but not as frequently.  Also, Glamour in modern day is occasionally abbreviated as simply Glam.