A lady's ring, worn on the hand, comprising a band of precious metal (usually gold) set with a continuous line of identically cut gemstones (usually diamonds) to symbolize never-ending love, usually given by a husband to his wife on a significant anniversary.

plural of eternity ring

(mythology, fiction, fantasy) A magical state of suspended animation, a state of ageless, deathless, everlasting sleep. Well-known examples are Endymion, (the lover of the Greek moon goddess, Selene), and the princess from Sleeping Beauty.

(cosmology, religion, philosophy) Eternal recurrence.

(cosmology, religion, philosophy) The belief or theory that all the events in cosmic history repeat in an endless cycle.

plural of eternal triangle

(Christianity) The sin which is unpardonable by God and therefore make salvation impossible.

plural of eternal sin

(Internet slang, historical) A period beginning around 1993, in which large amounts of new users were joining Usenet.

(space science) A mountain peak, on a solid, non-luminous celestial body, which experiences continuous or near-continuous illumination due to a combination of high altitude, very high latitude, and being on a celestial body with very low axial tilt.