Definition from Wiktionary, the free dictionary
preauction (not comparable)
- Before an auction.
2008 May 8, Sophia Kishkovsky, “A Treasure Is Restored, With Culture Its Bounty”, in New York Times:
- Christie’s held a preauction showing for rich Russian art collectors at Pashkov House last fall, and Boucheron, the French jewelry house, held an exhibition and soirée there in March.