Enter a clue or pattern or both:

The Clue

Chapter of history (3 letter answer)

The Answer

ERA

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Notes

The answer ERA is very common and appears about once every 16 puzzles.

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Time to remember
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Proposed amendment, for short
Stat of interest to Catfish
Time worth noting
"The ___ of Wonderful Nonsense": Pegler
An earlier one may be recalled
It may have periods
Pitchers want it low

Definition

ERA as a noun:

1. (era, epoch) = a period marked by distinctive character or reckoned from a fixed point or event
2. (era, geological era) = a major division of geological time; an era is usually divided into two or more periods
3. (earned run average, ERA) = (baseball) a measure of a pitcher's effectiveness; calculated as the average number of earned runs allowed by the pitcher for every nine innings pitched