A rally is a large public meeting that is held in order to show support for something such as a political party.
e.g. About three thousand people held a rally to mark international human rights day...
e.g. Supporters of the policy are reported to be gathering in Delhi for a mass rally.
When people rally to something or when something rallies them, they unite to support it.
e.g. His supporters have rallied to his defence...
e.g. He rallied his own supporters for a fight.
When someone or something rallies, they begin to recover or improve after having been weak.
e.g. He rallied enough to thank his doctors...
e.g. Markets began to rally worldwide.
A rally is a competition in which vehicles are driven over public roads.
e.g. Carlos Sainz of Spain has won the New Zealand Motor Rally.
e.g. ...an accomplished rally driver.
A rally in tennis, badminton, or squash is a continuous series of shots that the players exchange without stopping.
e.g. ...a long rally.