Definition from Wiktionary, the free dictionary
Shortening of press availability, itself a shortening of "press availability session." First recorded in early 1990s.
- (US, politics, journalism) An open-ended question and answer session with the media.
1992, April 18, “Craig R. McCoy”, in A Campaign Juggernaut Jaunts Through Phila., page A4:
- "There won't be a press avail," she explained briskly about Clinton's first stop at - where else - the Italian Market. "It'll basically be a photo op."