Clarification of the Scriptural Definition of Death

The effects of Adam's transgression were spiritual death - separation from the presence of God - and physical (or temporal) death - separation from the presence of a physical body, symbolic of the spiritual death which already occurred - and both affect all of mankind. Although we usually refer to them as two deaths, in the scriptures they are referred to as one death, specifically the first death:

"Yea, behold, this death [Christ's death] bringeth to pass the resurrection, and redeemeth all mankind from the first death—that spiritual death; for all mankind, by the fall of Adam being cut off from the presence of the Lord, are considered as dead, both as to things temporal and to things spiritual."

This first death is a result of the first judgment which came upon man (2 Nephi 9:7). This is the only place in scripture that refers to the final event in the garden of Eden as a judgment.

When Jacob says "may God raise you from death by the power of the resurrection" (2 Nephi 10:25) he is referring to the first death; not only the physical (or temporal) portion of that death but both. Of the first death, the two portions happen at different times. First spiritual death and second physical death. What was last shall be first. We cannot be restored to the presence of God without being first restored to the presence of our body. We cannot be restored to it without losing it.

Now that we have discussed the details of the first death lets talk about the last death. This is referred to in several ways - the last death, the second death and everlasting death. This death comes upon all those who will not be saved. They have rejected the Holy Ghost and the baptism thereof and will not receive any glory.

When we are saved during this probationary state we are not yet brought back into the presence of God the Father. In fact, being saved here doesn't bring us back into the presence of God the Father, but allows us to stay in God's presence after Christ brings us back (through resurrection) to cover the effects of Adam's transgression. The resurrection brings all mankind back into the presence of the God. If we were only reunited with our body and not brought back into the presence of God, the resurrection would be incomplete:
"The resurrection of Christ redeemeth mankind, yea, even all mankind, and bringeth them back into the presence of the Lord."

Those who are not saved will be resurrected and brought back into the presence of God (covering for Adam's transgression) and then will be judged of there sins and be cast back out to remain forever with the devil and his angels. This is the second death or a second separation. They could not be separated a second time if they were not restored after the first time.

Even the saved must die physically (to complete the first death) because they have already died spiritually and that is one death. Being saved secures us against the second death, it secures eternal life.

"Wherefore, may God raise you from death by the power of the resurrection, and also from everlasting death by the power of the atonement, that ye may be received into the eternal kingdom of God, that ye may praise him through grace divine. Amen."