Perpetuity of existence. The doctrine of immortality is taught in the Old Testament. It is plainly implied in the writings of Moses (Genesis 5:22, 24; 25:8; 37:35; 47:9; 49:29, Comp. Hebrews 11:13-16; Exodus 3:6, Comp. Matthew 22:23). It is more clearly and fully taught in the later books (Isaiah 14:9; Psalm 17:15; 49:15; 73:24). It was thus a doctrine obviously well known to the Jews.

With the full revelation of the gospel this doctrine was "brought to light" (2 Timothy 1:10; 1 Corinthians 15; 2 Corinthians 5:1-6; 1 Thessalonians 4:13-18).

Noah Webster's New International Dictionary of the English Language

1. (n.) The quality or state of being immortal; exemption from death and annihilation; unending existence; as, the immortality of the soul.

2. (n.) Exemption from oblivion; perpetuity; as, the immortality of fame.