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From the Editors at Merriam-Webster
Absent Letters That Are Heard Anyway
Absent Letters That Are Heard Anyway
They aren't seen but they are heard
Cite this Entry
“O.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/o. Accessed 26 Feb. 2020.
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Time Traveler for o
The first known use of o was before the 12th century
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