1. to show clearly by giving proof or evidence
2. to show how something works or is done by doing it yourself
3. to take part in a public protest or march to express opinions

Examples

• The experiment demonstrates that water boils at 100 degrees Celsius.
• She demonstrated her commitment by working overtime every day.
• The teacher demonstrated how to solve the math problem on the board.
• Can you demonstrate the proper way to use this machine?
• Thousands of people demonstrated against the new law.
• Students demonstrated outside the university demanding lower tuition fees.
• His actions demonstrate his true character.
• The chef demonstrated several cooking techniques to the class.