Charles Buck Theological Dictionary
One of the names of the Supreme Being in the Scriptures. The proper meaning of the word is "my Lords, " in the plural number; as Adoni is my Lord, in the singular. The Jews, who either out of respect or superstition do not pronounce the name of Jehovah, read Adonai in the room of it, as often as they meet with Jehovah in the Hebrew text. But the ancient Jews were not so scrupulous; nor is there any law which forbids them to pronounce the name of God.
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Buck, Charles. Entry for 'Adonai'. Charles Buck Theological Dictionary. https://www.studylight.org/dictionaries/eng/cbd/a/adonai.html. 1802.