Strong's Concordance

Original word: ἐπόπτης
Transliteration: epoptés
Definition (short): eyewitnesses
Definition (full): a looker-on, a spectator

NAS Exhaustive Concordance

Word Origin: from epi and the fut. of horaó
Definition: a looker-on, i.e. a spectator
NASB Translation: eyewitnesses (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From epi and a presumed derivative of optanomai; a looker-on -- eye-witness.

see GREEK epi

see GREEK optanomai

KJV: For we have not followed cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty.
NASB: For we did not follow cleverly devised tales when we made known to you the power and coming of our Lord Jesus Christ, but we were eyewitnesses of His majesty.