1. a group or set of seven
Usage: formal; technical

Examples

• The heptad of colors in the rainbow includes red, orange, yellow, green, blue, indigo, and violet.
• Ancient philosophers often organized their teachings around a heptad of principles.
• The musical composition featured a heptad of instruments playing in harmony.
• The researcher identified a heptad of factors contributing to the phenomenon.
• The committee was structured as a heptad of representatives from different departments.
• In mythology, the heptad of gods ruled over different aspects of nature.