Definition of appearance:
outward or visible aspect of a person or thing
the event of coming into sight
formal attendance (in court or at a hearing) of a party in an action
a mental representation; "I tried to describe his appearance to the police"
the act of appearing in public view; "the rookie made a brief appearance in the first period"; "it was Bernhardt's last appearance in America"
pretending that something is the case in order to make a good impression; "they try to keep up appearances"; "that ceremony is just for show"