Strong's #3801: opsonion (pronounced op-so'-nee-on)

a phrase combining 3588 with the present participle and imperfect of 1510 and the present participle of 2064 by means of 2532; the one being and the one that was and the one coming, i.e. the Eternal, as a divine epithet of Christ:--which art (is, was), and (which) wast (is, was), and art (is) to come (shalt be).

Thayer's Greek Lexicon:

̔ ̓̀ ́ ̔ ̓͂ ́ ̔ ̓́

ho ōn kai ho ēn kai ho erchomenos

1) He who is, and was, and is coming

Part of Speech: phrase

Relation: a phrase combining G3588 with the present participle and imperfect of G1510 and the present participle of G2064 by means of G2532

Usage:

This word is used 4 times:

 

Revelation 1:4: "and peace, from him which is, and which was, and which is to come; and from the seven"
Revelation 1:8: "the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty."
Revelation 4:8: "saying, Holy, holy, holy, Lord God Almighty, which was, and is, and is to come."
Revelation 11:17: "We give thee thanks, O Lord God Almighty, which art, and wast, and art to come; because thou hast taken to thee thy"