Definitions:
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)

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