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pre·mar·ket | \ (ˌ)prē-ˈmär-kət 
\
\variants:
or pre-market
Definition of premarket
1 : occurring in the period prior to a product being available for purchase
premarket safety testing a premarket clinical study of a drug Dietary supplements are essentially exempt from premarket approval and testing because, unlike many drugs, they do not claim to be effective, pure, and safe.— Noel C. Paul … fixed a premarket problem that led to lost pressure in the control. — Bicycling
2 : occurring prior to the opening of a stock market premarket trading
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Time Traveler for premarket
The first known use of premarket was in 1923
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