For in Him dwelleth all the fulness of the Godhead bodily (Colossians 2:9).
The term Godhead occurs three times in the King James translation. Each time it translates a slightly different Greek noun, all being slight modifications of the Greek word for God (theos, from which we derive such English words as theology). It essentially means the nature, or structure of God, as He has revealed Himself in His word.
The first occurrence is in Acts 17:29: We ought not to think that the Godhead is like unto gold or silver, or stone, graven by art and mans device. Men have been guilty throughout the ages of trying to model the Godhead, but this leads quickly to idolatry, whether that model is a graven image of stone or a philosophical construct of the mind.
What man cannot do, however, God has done, in the very structure of His creation. The invisible things of Him from the creation of the world are clearly seen, being understood by the things that are made, even His eternal power and Godhead (Romans 1:20). His tri-universe (space, matter, and time, with each component unique in definition and function, yet permeating and comprising the whole) perfectly models His tri-une nature (Father, Son, Holy Spiriteach distinct, yet each the whole).
This analogy can be carried much further, for this remarkable tri-unity pervades all reality. The tri-universe is not God (that would be pantheism), but it does clearly reflect and reveal the tri-une nature of His Godhead.
The last occurrence of the word is in our text. Although we cannot see the Godhead in its fullness, that fullness does dwell eternally in the Lord Jesus Christ. All that God is, is manifest in Him. And ye are complete in Him (Colossians 2:10). HMM