Synonyms and related words :
amidships, average, axial, center, centermost, central, centralized, centric, centroidal, centrosymmetric, concentrated, core, diameter, diaphragm, equator, equatorial, equidistant, geocentric, halfway, heart, interior, intermediary, intermediate, kernel, key, mean, medial, median, mediocre, mediterranean, medium, mesial, mezzo, mid, middle, middlemost, middling, midland, midriff, midships, midst, midway, nuclear, nucleus, omphalic, pivotal, thick, thick of things, umbilical, waist, waistline, zone