There is evidence that water was abundant on Mars eons ago.
Source: tatoeba (1591754)
Ranked by relevance and common usage.
Keep "eons" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Choose a synonym only if it keeps the core idea of "eons" intact in the sentence you are editing.
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "eons", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
If the synonym makes the sentence slower, vaguer, or more dramatic than intended, keep "eons" or choose a simpler alternative from the closest-match group.
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5 total sentences available.
There is evidence that water was abundant on Mars eons ago.
Source: tatoeba (1591754)
Using cutting-edge machines that can detect the chemical composition in grains of soil as small as a speck of dust, the two Goddard labs will study how the building blocks of life evolved in our solar system and how the Moon’s surface chemistry was shaped over eons by radiation from space and from the Sun.
Source: tatoeba (8410032)
A beat of the wings, and eons are behind us!
Source: tatoeba (10472227)
Those days now feel like eons ago.
Source: tatoeba (10635603)
Showing 4 of 5 available sentences.
Closest matches include aeon, age, ages, epoch, era.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.