1. (a.) Equally distant from the extreme either of a number of things or of one thing; mean; medial; as, the middle house in a row; a middle rank or station in life; flowers of middle summer; men of middle age.

2. (a.) Intermediate; intervening.

3. (n.) The point or part equally distant from the extremities or exterior limits, as of a line, a surface, or a solid; an intervening point or part in space, time, or order of series; the midst; central portion

4. (n.) The waist.

active active voice amidships arbitrational arbitrative average axial axis balance bisect center center of action center of gravity center on center round centermost central centralize centralized centric centroid centroidal centrosymmetric centrum coming between concentrated core dead center double epicenter equatorial equidistant fold generality geocentric going between golden mean halfway happy medium heart hub intercessional intercessory intercurrent interior interjacent interlocutory intermedial intermediary intermediate intermediatory intervenient intervening interventional juste-milieu kernel key marrow mean medial median mediating mediative mediatorial mediatory medio-passive mediocre mediocrity mediterranean medium medulla mesial mesne metacenter mezzo mid middle course middle ground middle point middle position middle state middle voice middle-of-the-road middlemost middling midland midmost midpoint midriff midships midst midway nave navel norm normal nub nuclear nucleus omphalic omphalos pacificatory par passive passive voice pith pivot pivotal reflexive rule run stomach storm center umbilical umbilicus via media voice waist