1. the strength and vitality required for sustained physical or mental activity
2. power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines
3. the property of matter and radiation which is manifest as a capacity to perform work
Usage: physics

Examples

• She had enough energy to run five miles.
• The children were full of energy after their nap.
• Solar energy is becoming more affordable.
• The power plant generates energy from coal.
• We need to conserve energy to reduce our bills.
• Kinetic energy increases with velocity.
• He channeled his energy into his studies.