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Definition of sempiternal : 1. Of neverending duration; everlasting; endless; having beginning, but no end.
2. Without beginning or end; eternal.

Synonyms:

undated, interminable, everlasting, endless, constant, infinite, timeless, limited, dateless, eternal, incessant

Usage examples:

• Therefore into the justice sempiternal The power of vision that your world receives, As eye into the ocean, penetrates; Which, though it see the bottom near the shore, Upon the deep perceives it not, and yet 'Tis there, but it is hidden by the depth. - "Divine-Comedy-Longfellow-s-Translation-Complete", Dante Alighieri.
• This he will only have by inaction, by mewing his sempiternal youth in his cage and on his perch. - "Lore of Proserpine", Maurice Hewlett.
• The scene of judgment on which attention is concentrated forms but an episode in the universal, sempiternal scheme of things. - "The Life of Michelangelo Buonarroti", John Addington Symonds.