pre-ex·​po·​sure ˌprē-ik-ˈspō-zhər How to pronounce pre-exposure (audio)
variants or less commonly preexposure
: occurring, administered, used, or being in the period preceding exposure (as to a stimulus or a pathogen)
pre-exposure rabies vaccination
Canon has also added a red-eye reduction pre-exposure light …Herbert Keppler
see also pre-exposure prophylaxis
pre-exposure noun
Rats differ from monkeys and chicks in that simultaneous pre-exposure to two stimuli does facilitate their subsequent discrimination … R. A. Hinde

Word History

First Known Use

1906, in the meaning defined above

Time Traveler
The first known use of pre-exposure was in 1906

Dictionary Entries Near pre-exposure

Cite this Entry

“Pre-exposure.” Dictionary, Merriam-Webster, Accessed 5 Feb. 2023.

Medical Definition


pre-ex·​po·​sure -ik-ˈspō-zhər How to pronounce pre-exposure (audio)
variants preexposure
: of, relating to, occurring in, or being the period preceding exposure (as to a stimulus or a pathogen)
pre-exposure immunization
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