1 become or be visible.
2 be evident (a new problem then appeared).
3 seem; have the appearance of being (appeared unwell; you appear to be right).
4 present oneself publicly or formally, esp. on stage or as the accused or counsel in a lawcourt.
5 be published (it appeared in the papers; a new edition will appear).
Etymology: ME f. OF apareir f. L apparere apparit- come in sight
Useful english dictionary. 2012.