v.
1) to demonstrate convincingly
2) (B) ('to explain by showing') they demonstrated the new invention to us
3) (D; intr.) ('to protest by marching') to demonstrate against (the students demonstrated against the government)
4) (D; intr.) ('to display support by marching') to demonstrate for (to demonstrate for lower taxes)
5) (L; to) ('to prove by showing') we demonstrated (to them) that a new computer would save considerable time
6) (Q) ('to explain by showing') she demonstrated how the computer works