αὐθαίρετοςauthaíretos

self-chosen, i.e. (by implication) voluntary

Greek (New Testament) · G830

Meanings

1. self-chosen.

2. of one's own accord: 2 Corinthians 8:3, 2 Corinthians 8:17.

Same root

αὐτόςautós · G846the reflexive pronoun self, used (alone or in the comparative G1438 (ἑαυτοῦ)) of the third person , and (with the proper personal pronoun) of the other persons
αἱρετίζωhairetízō · G140to make a choice

Where it appears

Appears 2 times in the Bible.

2 Corinthians 8:3 For I can testify that they gave not only what they could afford, but far more. And they did it of their own free will.
2 Corinthians 8:17 Titus welcomed our request that he visit you again. In fact, he himself was very eager to go and see you.

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