Distinct areas or divisions of activity, especially in economics or business. Geometric sections of a circle or sphere.
From Latin 'sector', meaning 'cutter', from 'secare' (to cut). Originally a geometric term for a portion cut from a circle, it expanded to mean any distinct division or area of activity.
The economic use of 'sectors' brilliantly borrows from geometry - just as a pie can be cut into sectors, the economy is sliced into distinct pieces like technology, healthcare, and finance. Each sector represents a 'slice' of the total economic pie!
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