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keyman

noun
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key·​man | \ ˈkē¦man, -maa(ə)n \
plural keymen

Definition of keyman

: a person doing work of vital importance (as in a business organization) within ministry and cabinet alike, the prime minister is the keyman— F. A. Ogg & Harold Zink

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“Keyman.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/keyman. Accessed 5 Mar. 2021.

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