Lowered in musical pitch by a semitone; having a flat (♭) symbol in musical notation, or rendered flat in performance.
Derived from 'flat' in musical terminology, which comes from Old English 'flet' (flat, level). The musical meaning developed in the 16th-17th centuries as standardized notation evolved.
In music, the word 'flatted' gets interesting because singers and musicians intuitively lower certain notes based on the surrounding melody—concert pitch is actually a human invention that needed standardization!
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