A billion years

The answer to “A billion years” in the Eugene Sheffer crossword is EON — a 3-letter word. It most recently appeared in the Eugene Sheffer crossword on August 18, 2026, a Tuesday puzzle, at 3-Down. Below you'll find why that fill fits, every other answer we've recorded for this clue, and links into the puzzle it came from.

“A billion years” answer

EON (3 letters)

Reveal the solution one letter at a time with the tiles above if you'd rather nudge yourself toward it than see the whole word at once. Just want it outright? The answer is EON.

What does EON mean?

Reading the plain dictionary sense of EON is often the fastest way to see why it answers this clue.

When else has “A billion years” appeared?

Eugene Sheffer reuses clues across dates, sometimes with a different answer depending on the grid. Here's where this exact clue has shown up, and what the answer was each time — handy when you're checking whether today's fill is the only one.

August 18, 2026 (most recent) → EON. We haven't indexed another appearance of this exact clue yet.

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