demonstrate

show or demonstrate something to an interested audience

• “She shows her dogs frequently”
• “We will demo the new software in Washington”

establish the validity of something, as by an example, explanation or experiment

• “The experiment demonstrated the instability of the compound”
• “The mathematician showed the validity of the conjecture”

provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes

• “His high fever attested to his illness”
• “The buildings in Rome manifest a high level of architectural sophistication”
• “This decision demonstrates his sense of fairness”

march in protest; take part in a demonstration

• “Thousands demonstrated against globalization during the meeting of the most powerful economic nations in Seattle”