How to Say "eternity" in Spanish
The Spanish word for “eternity” is “eternidad” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
NounB1
infinite time

Examples
Dicen que el alma vivirá en la eternidad.
They say the soul will live in eternity.
Sentí que la película duró una eternidad, era muy aburrida.
I felt like the movie lasted an eternity; it was very boring.
Necesitamos comprender la diferencia entre tiempo y eternidad.
We need to understand the difference between time and eternity.
Feminine Noun Pattern
Most Spanish nouns that end in '-dad' (like 'ciudad', 'libertad') are feminine, so you must use 'la' before them: 'la eternidad'.
Confusing Gender
Mistake: “El eternidad.”
Correction: La eternidad. Remember the '-dad' ending is a strong signal for a feminine word.
Related Translations
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