What is another word for "middle"?

Roget's Thesaurus (1911) lists these synonyms for "middle": abatement, abecedary, abide, academic, academy, adjust, adjustment, agree, all, alma, ambo, amphitheater, anatomy, and, angustation, another, arbitration, arrange, art, auditorium, average, axial, axis, azygous, backbone, balance, best, boarding, bone, book, box, breadth, bridge, bring, buoyancy, cathedra, center, central, centrality, centralization.