Synonyms and related words :
amidships, average, axial, center, centermost, central, centralized, centric, centroidal, centrosymmetric, concentrated, core, equatorial, equidistant, geocentric, halfway, interior, intermediary, intermediate, key, mean, medial, median, mediocre, mediterranean, medium, mesial, mezzo, mid, middle, middling, midland, midmost, midships, midway, nuclear, omphalic, pivotal, umbilical