1 to show clearly: This demonstrates his ignorance of the situation.
az: göstərmək, nümayiş etdirmək
ru: иллюстрировать
2 to show how something works or is done: He demonstrated how the new vacuum cleaner worked.
az: göstərmək
ru: (про)демонстрировать
3 to express an opinion (usually political) by marching, showing banners etc in public: A crowd collected to demonstrate against the new taxes.
az: etiraz mitinqinə çıxmaq
ru: участвовать в демонстрации