1. kingdoms or countries ruled by a monarch
2. areas of activity, interest, or knowledge; spheres

Examples

• The ancient realms of Europe were often at war with each other.
• She studied the realms of science and mathematics.
• The treaty established peace between the neighboring realms.
• His expertise spans multiple realms of technology.
• The fairy tale described magical realms beyond imagination.
• Academic realms require different skills than business realms.
• The king ruled over vast realms stretching across continents.