pre·​mar·​ket | \ (ˌ)prē-ˈmär-kət How to pronounce premarket (audio) \
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

First Known Use of premarket

1923, in the meaning defined at sense 1

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The first known use of premarket was in 1923

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a haphazard or makeshift solution

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