Added 10 October 2026 premarket adjective Categories: Rare Words adjective ! Definition from Wiktionary (CC BY-SA). More about premarket at Wordnik → Where our words come from → Prior to a product's official market release premarket testing noun The informal market in stocks and other securities, held before the official markets open Stocks are up in premarket trading this morning. Related Words: classbetaprepre-preretailprereleasepresalespretradepostmarketprepublicpreopeningsneak Back to today's word