the world > relative properties > wholeness > incompleteness > part of whole > [noun] > a separate part > a piece or bit > added to or subtracted from a surface or figure (2)
Chiefly as a technical term: a piece taken from, or added to, a regularly-shaped object. Obsolete.
Something added to an existing object or quantity; an additional component or sum; an accessory device, esp. one designed to increase capability.