Lexical Definition

‎αἴτιον‎ aítion (ah'-ee-tee-on) reason for charge ^G:N-N
neuter of ‎αἴτιος‎

cause, fault.

• a reason or crime (like ‎αἰτία‎)

Abbott-Smith

* αἴτιον, -ου, τό, v.s. αἴτιος.

Liddell-Scott-Jones

αἴτιον-ος, α, ον,

more rarely ος, ον [Refs 5th c.BC+]:— culpable, responsible, ἐπεὶ οὔ τί μοι αἴτιονοί εἰσιν[Refs 8th c.BC+]: comparative αἰτιώτερος[Refs 5th c.BC+] the most guilty, [Refs 5th c.BC+]

__2 substantive, αἴτιονος, ὁ, the accused, the culprit, [Refs 4th c.BC+]; οἱ αἴ. τοῦ πατρός they who have sinned against my father, [Refs]:—with genitive of things, οἱ αἴ. τοῦ φόνου[Refs 5th c.BC+]
__II responsible for, with genitive of things, [Refs 5th c.BC+]; αἴτιονός τινός τινι being the cause of a thing to a person, [Refs 5th c.BC+]: with infinitive, αἴ. τὸν ἠέρα ξηρὸν εἶναι[αἴτιονος τὸ σὲ ἀποκρίνασθαι 5th-6th c.BC: Plato Philosophus “Laches” 190e">Refs 5th c.BC+]: comparative, τοῦ.. ἐλευθέραν εἶναι.. αἰτιώτερον[Refs 4th c.BC+] mainly instrumental in causing the sea-fight, [Refs 5th c.BC+]
__II.2 αἴτιονον, τό, cause, [Refs 5th c.BC+]; τί ποτ᾽ οὖν ἐστι τὸ αἴτιονον τό.. μηδένα εἰπεῖ; [Refs 5th c.BC+]