τετράς, άδος, ἡ,
the number four, [[ 4th c.BC: Aristoteles Philosophus “Metaphysica” 1081b16, 1090b23, 1st c.AD: Philo Judaeus 1.22, 1st-2nd c.AD: Plutarchus Biographus et Philosophus “Lycurgus” 5, etc. ] Refs 4th c.BC+]
__2 the fourth dav of the month, [[ “hymnus ad Mercurium” 19, 8th-7th c.BC: Hesiodus Epicus “Opera et Dies” 794, 798, 5th-6th c.BC: Aristophanes Comicus “Nubes” 1131, 5th c.BC: Thucydides Historicus 5.54, “IG” 12.304.50,62, etc.] Refs 8th c.BC+]; so Boeotian dialect πετράς (which see); τετράδι γέγονας, proverbial of one born to a life of labour [[compare (τετραδισταί 11), 5th-6th c.BC: Plato Comicus 100, compare 5th-6th c.BC: Aristonymus Comicus 4, 5th c.BC: Sannyrio Comicus 5. ] Refs 5th c.BC+]
__2.b the fourth day of the week, Wednesday, [[ 4th-6th c.AD: Codex Justinianus 9.4.6.1. ] Refs 4th c.AD+]
__3 a space of four days, [[ 5th c.BC: Hippocrates Medicus “προγνωστικόν” 20. ] Refs 5th c.BC+]
__4 the four quarters of the moon, [[ 4th-3rd c.BC: Theophrastus Philosophus “de Signis Tempestatum” 5, 27, 38. ] Refs 4th c.BC+]
__II ={τετραρχία}[[ 1, 5th c.BC: Hellanicus Historicus 52 1st c.AD: Josephus Historicus ] Refs 5th c.BC+]
__III κατὰ τετράδα διατετάχθαι in four divisions, [[ 1st c.BC: Asclepiodotus Tacticus “Tact.” 3.1. ] Refs 1st c.BC+]