Definition of by/on/upon request
: by asking for something usually in a formal way
Catalogs are available by/on/upon request.
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“By/on/upon request.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/by%2Fon%2Fupon%20request. Accessed 29 Nov. 2021.
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