Archaic KJV Word
Darkness
Modern equivalent: absence of light
What Was Lost
The active menace. In Hebrew cosmology, darkness was not just the absence of light but an active force -- the primordial chaos that God pushed back to make room for creation. 'The light shineth in darkness and the darkness comprehended it not' described a cosmic battle, not a light switch.
Closest Survivor in Modern English
darkness (still used metaphorically but understood as passive absence rather than active threat)
Peak Usage (1611)
KJV Genesis 1:2 -- 'Darkness was upon the face of the deep'; John 1:5 -- 'The light shineth in darkness'
Died still used but reduced (~1700)
Hebrew choshek ('darkness/chaos/absence of God's ordering presence') reduced to mere absence of photons. The theological-cosmic dimension of darkness as active anti-creation force was lost to physics.
What Replaced It
“absence of light”
Physical phenomenon; choshek was the chaos that existed before God spoke -- an active force of disorder
“nighttime”
Daily cycle; biblical darkness was cosmic threat -- the deep, the void, the anti-creation
“ignorance”
Intellectual metaphor only; darkness was spiritual, moral, and cosmically threatening