Umami has always been a word, just not a borrowed one in English until recently. Also: umami. Apparently, it has been adopted into the English language since 1979.

This thing is kinda like how Pluto is no longer a planet.

Heh, in grade 4, my supply teacher tried to tell me that Jupiter did not have a ring. I told her she was wrong, which she was, even though my friend try to tell me she's the teacher so she should know better than me.