Mortal, Mortality - Vine's Expository Dictionary of New Testament Words
Mortal, Mortality[ 1,,G2349, thnetos ]
subject or liable to death, mortal" (akin to thnesko, "to die"), occurs in Romans 6:12, of the body, where it is called "mortal," not simply because it is liable to death, but because it is the organ in and through which death carries on its death-producing activities; in Romans 8:11, the stress is on the liability to death, and the quickening is not reinvigoration but the impartation of life at the time of the Rapture, as in 1 Corinthians 15:53-54; 2 Corinthians 5:4 (RV, "what is mortal;" AV, "mortality"); in 2 Corinthians 4:11, it is applied to the flesh, which stands, not simply for the body, but the body as that which consists of the element of decay, and is thereby death-doomed. Christ's followers are in this life delivered unto death, that His life may be manifested in that which naturally is the seat of decay and death. That which is subject to suffering is that in which the power of Him who suffered here is most manifested.