1. Plural of heyday; periods of greatest success, popularity, or vigor.
Usage: Always used in plural form when referring to multiple peak periods.

Examples

• The heydeys of silent film were in the 1920s.
• During the heydeys of the music industry, record sales reached their highest levels.
• She remembered the heydeys of her career with great fondness.
• The heydeys of that fashion brand have long since passed.
• Many actors look back on the heydeys of their youth with nostalgia.
• The heydeys of arcade gaming ended when home consoles became popular.