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

A collar worn by a BDSM submissive as a sign of devotion and never taken off

plural of eternity collar

(cosmology, religion, philosophy) Eternal recurrence.

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

Immortality. / (religion) Life after death; the afterlife.

A nickname for the city of Rome. / A nickname for the city of Kyoto in Japan.

(idiomatic) A relationship involving three persons (usually two women and one man or two men and one woman) among whom there are conflicting and competing attachments of a romantic or emotional nature.

(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.