To energize means to fill something or someone with energy, power, or excitement. When you energize a flashlight by putting in fresh batteries, you give it the power it needs to work. When a coach's halftime speech energizes the team, the players return to the field with renewed enthusiasm and determination.

You can energize people in different ways. A good night's sleep energizes your body for the day ahead. An inspiring book might energize your imagination. A teacher who makes learning fun energizes students who were feeling bored or discouraged. Music can energize a party, turning a quiet gathering into a lively celebration.

The word also has a literal, electrical meaning. When you flip a light switch, you energize the circuit, allowing electricity to flow and the bulb to glow. Power lines get energized when the utility company sends electricity through them.

Sometimes people talk about feeling energized after exercise, even though it seems backward: you'd think running around would make you tired, not more energetic. But physical activity can leave people feeling more alert and alive, ready to tackle whatever comes next. That refreshed, powerful feeling is what it means to be energized.