What Word Begins And Ends With An E But Only Has One Letter?

According to Collins Dictionary, a riddle is
1. A problem or puzzle in the form of a question, statement, etc. so formulated that some ingenuity is required to solve or answer it; conundrum
2. Any puzzling, perplexing, or apparently inexplicable person or thing, as a difficult problem or enigmatic saying; enigma

Now that we know a little about riddles, are you ready to solve one of our favorites?

Riddle: What Word Begins And Ends With An “E”, But Only Has One Letter?

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