Wiktionary
gaa
abbr. (context sports English) goals against average, a sports statistic init. Gaelic Athletic Association, the governing body of the Irish sports of hurling, Gaelic football, Ladies Gaelic football and handball.
Wikipedia
GAA
GAA may refer to the following:
Usage examples of "gaa".
Diana Gaa An old tramp steamer that Gunn remembers Pitt using to locate the mysterious seamount in pacific Vortex.