The word “eternity” comes from the Latin word “aeternitas,” which itself is derived from “aeternus” meaning “endless” or “timeless.” “Aeternus” is formed from “ae” (an archaic form of “aevum,” meaning “age” or “lifetime”) and “ternus,” a suffix denoting a perpetual or enduring state. The concept of eternity refers to an infinite time duration, something that lasts forever, beyond the temporal confines of the physical world.