an estimated time of arrival, in particular the time at which an aircraft or ship is expected to arrive at its destination

a Basque separatist movement in Spain, founded in 1959

edited to add (used in online discussions to indicate that one has modified the content of a post one has made, typically in order to add something)

ETA: sorry, didn't see your post before I posted mine, @Abc!

the seventh letter of the Greek alphabet (Η, η), transliterated as ‘e’ or ‘ē’