ignorar
/iɡnoˈɾaɾ/ · B1 · verb
to not know, be ignorant of
Latin ignorare = in- (not) + gnarus (knowing); same root as ignorant
Spanish keeps both senses: the older one, to not know (ignoro la respuesta = I don't know the answer), and the English-style one, to ignore. Think ignorant first, ignore second, and both meanings stay attached.