1. plural of kingdom; countries ruled by kings or queens
2. major groups in biological classification, such as the animal kingdom or plant kingdom
Usage: biology
3. areas of activity or influence; domains
Usage: figurative

Examples

• The ancient kingdoms of Egypt and Mesopotamia were centers of early civilization.
• Medieval European kingdoms often fought wars over territory and trade routes.
• Scientists classify all living things into different kingdoms based on their characteristics.
• The animal kingdom includes everything from tiny insects to massive whales.
• She ruled over vast kingdoms of knowledge in mathematics and physics.
• The business world contains many different kingdoms of industry and commerce.