1. a putting together, composition , (Aristotle Philosopher); ς. προσώπου a studied expression of countenance, of Pericles, (Plutarch) 2. a bringing together, introduction, recommendation , (Polybius Historicus) 3. συνίσταμαι); a standing together, meeting : in hostile sense, close combat, conflict , (Herdotus Historicus); metaphorically, ς. γνώμης a conflict of mind, intense anxiety, (Thucydides) 4. a meeting, a knot of men , (Euripides); κατὰ ξυστάσεις γιγνόμενοι forming into knots , (Thucydides): a political union , (Demosthenes Orator) 5. friendship or alliance , (Polybius Historicus): a conspiracy , (Plutarch) 6. construction, structure, constitution , (Plato Philosophus): absolute a political constitution , (Plato Philosophus) 7. metaphorically of the mind, ς. φρενῶν contraction, sternness, sullenness , (Euripides) (ML)