Plural of heptad; multiple groups or sets of seven things, used in scientific, musical, or organizational contexts.
Standard English plural formation of 'heptad' by adding '-s'. Maintains the Greek root 'hepta' meaning seven while making it countable.
In music theory, heptads of notes create the foundation of jazz harmony—take seven notes from different positions and you unlock complex harmonic possibilities that revolutionized 20th-century music!
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