WordNet (r) 3.0 (2006):

ETA
    n 1: a terrorist organization organized in 1959 by student
         activists who were dissatisfied with the moderate
         nationalism of the traditional Basque party; want to create
         an independent homeland in Spain's western Pyrenees; "in
         1968 ETA launched a campaign of political assassinations of
         government officials" [syn: Basque Homeland and Freedom,
         Basque Fatherland and Liberty, Euskadi ta Askatasuna,
         ETA]
    2: the 7th letter of the Greek alphabet

V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

ETA
       Estimated Time of Arrival (SCP)