σύστασις σύστᾰσις, εως, συνίστημι a putting together, composition, Arist.; σ. προσώπου a studied expression of countenance, of Pericles, Plut. a bringing together, introduction, recommendation, Polyb., Plut. (συνίσταμαι) a standing together, meeting: in hostile sense, close combat, conflict, Hdt.; metaph., σ. γνώμης a conflict of mind, intense anxiety, Thuc. a meeting, a knot of men, Eur.; κατὰ ξυστάσεις γιγνόμενοι forming into knots, Thuc.: a political union, Dem. friendship or alliance, Polyb.: a conspiracy, Plut. construction, structure, constitution, Plat., Arist.: absol. a political constitution, Plat. metaph. of the mind, σ. φρενῶν contraction, sternness, sullenness, Eur.