variants:
or sub-sector
plural subsectors or sub-sectors
Definition of subsector
: a sector that is part of a larger sector
…the category is more diversified than you may think, since it can include such varied subsectors as aerospace components, high-tech industrial machinery, and scientific instruments.— Stephanie Losee
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Merriam-Webster unabridged
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Time Traveler for subsector
The first known use of subsector was in 1906
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