σύμμετρ-ος, ον,
(μέτρον) commensurate with, of like measure or size with, σύμμετρος σῷ ποδί (i.e. ἡ βάσις) [[ 5th c.BC: Euripides Tragicus “Electra” 533; χαμεύνῃ [prev. author] “fragment” 676 ] Refs 5th c.BC+]; βόστρυχον.. σύμμετρον τῷ σῷ κάρᾳ exactly like it, [[ 4th-5th c.BC: Aeschylus Tragicus “Choephori” 230 ] Refs 4th c.BC+]: especially of Time, commensurate with, keeping even with, δαλὸν ἥλικα ξύμμετρόν τε διαὶ βίου [[[prev. work] 610 (Lyric poetry)] Refs]; τῷδε τἀνδρὶ σ. being of like age with him, [[ 5th c.BC: Sophocles Tragicus “Oedipus Tyrannus” 1113 ] Refs 5th c.BC+]; ποίᾳ ξύμμετρος προὔβην τύχ; coincident with what chance have I come? i.e. in the very nick of time, [[ [prev. author] “Ant.” 387, compare 5th c.BC: Euripides Tragicus “Alcestis” 26 (below 111). ] Refs 5th c.BC+]
__2 in Mathematics, having a common measure, σύμμετροι αἱ τῷ αὐτῷ μέτρῳ μετρούμεναι (i.e. γραμμαί) [[ 4th c.BC: Aristoteles Philosophus “de Lineis Insecabilibus” 968b6 ] Refs 4th c.BC+]; frequently denied of the relation between the diagonal of a square and its side, [[ [prev. author] “APo.” 71b27, “APr.” 41a26, “Ph.” 221b25, “Rh.” 1392a18 ] Refs]; [τὸ νόμισμα] πάντα ποιεῖ σύμμετρα commensurable, [[ [prev. author] “EN” 1133b22 ] Refs]; μήκει οὐ σύμμετροι τῇ ποδιαίᾳ not lineally commensurate with the one-foot side, [[ 5th-6th c.BC: Plato Philosophus “Theaetetus” 147d, compare 148b ] Refs 5th c.BC+]: comparative, of musical intervals, ταῖς αἰσθήσεσιν εὐληπτότερα τὰ -ότερα [[ 2nd c.AD: Ptolemaeus Mathematicus “Harmonica - Opera Mathematica” 1.10. ] Refs 2nd c.AD+]
__3 in accord with the metre, [[ 5th c.BC: Sophocles Tragicus “Elegiae - PLG” 1 ] Refs 5th c.BC+]; σύμμετροι ἐπεκτύπεον ποδῶν χορείαις in time, [[ 5th-6th c.BC: Timotheus Lyricus “Persae” 213. ] Refs 5th c.BC+]