G2030
ἐπόπτης
eyewitness
ἐπόπτης, -ου, ὁ [in LXX (of God): Est.5:1, 2Ma.3:39 2Mac 7:35, 3Ma.2:21 * ;] __1. an overseer (LXX, ll. with). __2. a spectator: 2Pe.1:16 (of ἐ. as applied to God, see parallels in Inscr., MM, Exp., xiv; of the use of this term in the mysteries, see Mayor on 2Pe, l.with; Thayer, see word).† (AS)
The KJV translates G2030 in the following manner:
eyewitnesses (2x)
Full Thayer's lexicon entry
ἐπόπτης — epóptēs
ἐπόπτης, ἐπόπτου, ὁ (from unused ἐπόπτω);
1. an overseer, inspector, see ἐπίσκοπος; (Aeschylus, Pindar, others; of God, in 2Ma 3:39 2Ma 7:35; 3Ma 2:21; Additions to Est 5:1; ἀνθρωπίνων ἔργων, Clement of Rome, 1 Cor. 59, 3 [ET]).
2. a spectator, eye-witness of anything: so in 2Pe 1:16; inasmuch as those were called ἐπόπται by the Greeks who had attained to the third (i. e. the highest) grade of the Eleusinian mysteries (Plutarch, Alcib. 22, and elsewhere), the word seems to be used here to designate those privileged to be present at the heavenly spectacle of the transfiguration of Christ.
1 occurrence