Lexical Definition

‎συμφωνία‎ symphōnía (soom-fo-nee'-ah) music ^G:N-F
from ‎σύμφωνος‎

music.

• unison of sound ("symphony"), i.e. a concert of instruments (harmonious note)

Abbott-Smith

συμφωνία, -ας, ἡ (< σύμφωνος), [in LXX: Da LXX TH 3:5, 15, TH ib. 7, 10 (סוּמפֹּנְיָה) IV Mac 14:3 A * ;]
1. symphony, music: Lk 15:25
2. a musical instrument (Polyb., al.; Da, ll. c.; v MM, xxiv).†

Abbott-Smith References

Liddell-Scott-Jones

συμφωνία-ία, ἡ,

concord or unison of sound, τὴν ἐν τῇ ᾠδῇ ἁρμονίαν, ἢ δὴ σ. καλεῖται [Refs 5th c.BC+]

__2 of two sounds only, musical concord, accord, such as the fourth, fifth, and octave, [Refs 5th c.BC+]; ἡ διὰ πασῶν σ. [Refs 5th c.BC+]; distinguished from mere ὁμοφωνία, [Refs 4th c.BC+]
__3 harmonious union of many voices or sounds, concert, οἱ τῶν σ. λόγοι, the [Refs 4th c.BC+] doctrine of the music of the spheres, [Refs]
__II metaphorically, harmony, agreement, [Refs 5th c.BC+]; μείξας πάντα κατὰ συμφωνίαίαν, of a cook, [Refs 4th c.BC+]; unanimily, σ. τῶν ἱστορησάντων [Refs 2nd c.AD+] concordance, of theory with observed fact, ἔχειν τοῖς φαινομένοις σ. [Refs 4th c.BC+] ={τὸ συμπεφωνημένον} [συμφωνίαέω 11.2)">Refs], the amount agreed upon, [Refs 1st c.AD+]
__III band, orchestra, Ἑλληνικά 1.19 [Refs 1st c.AD+], and so perhaps in [Refs 2nd c.BC+], but used of a musical instrument in [LXX]; so Latin symphonia, of a kind of drum, [Refs 1st c.AD+]; symphoniae et cymbala strepitusque, [συμφωνίαίας καὶ Χορῶν NT.Luke.15.25. ">NT+1st c.AD+]

_{LSJ Scripture Refs: LXX.Dan.3.5 ☩ Luke.15.25}