αἴτιοςaítios

causative, i.e. (concretely) a causer

Greek (New Testament) · G159

Meanings

1. causative of, responsible for; as as a noun, ὁ αἰ., the cause, author: Hebrews 5:9; τὸ αἰ., the cause, Acts 19:40.

2. blameworthy, culpable; as as a noun, ὁ αἰ., the culprit, the accused (Lat. reus); τὸ αἰ. (= αἰτία, 3), the crime, Luke 23:4, Luke 23:14, Luke 23:22.

Same root

Where it appears

Appears 5 times in the Bible.

Luke 23:4 Pilate turned to the leading priests and to the crowd and said, “I find nothing wrong with this man!”
Luke 23:14 and he announced his verdict. “You brought this man to me, accusing him of leading a revolt. I have examined him thoroughly on this point in your presence and find him innocent.
Luke 23:22 For the third time he demanded, “Why? What crime has he committed? I have found no reason to sentence him to death. So I will have him flogged, and then I will release him.”
Acts 19:40 I am afraid we are in danger of being charged with rioting by the Roman government, since there is no cause for all this commotion. And if Rome demands an explanation, we won’t know what to say.”
Hebrews 5:9 In this way, God qualified him as a perfect High Priest, and he became the source of eternal salvation for all those who obey him.

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.