Definition of noncore
: not being a central or foundational part of something : not being or belonging to a core
… the noncore content areas of art, music, and physical education …— Bomna Ko … businesses have redrawn their boundaries, making them both tight (as they focus on core competencies) and porous (as they outsource noncore work).— Thomas A. Stewart
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Merriam-Webster unabridged
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Time Traveler for noncore
The first known use of noncore was in 1938
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