field·​man | \ ˈfē(ə)l(d)mən, -ˌman, -ˌmaa(ə)n\
plural fieldmen

Definition of fieldman

: one that works in the field: such as
a : a traveling representative of a business organization (as a man who negotiates with farmers for the raising of crops under contract for a food-processing company)
b : an investigator or advisor who works outdoors or away from the center of administration or activity (as a man who conducts educational programs for milk producers in an assigned territory)

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First Known Use of fieldman

1866, in the meaning defined above

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The first known use of fieldman was in 1866

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not constant or steady

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