as in principles
usually ABC's or ABCs plural
general or basic truths on which other truths or theories can be based
a book on the ABCs of computer usage
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“ABC.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/ABC. Accessed 29 Nov. 2023.
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Britannica.com: Encyclopedia article about ABC
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