Leaders and personalities from around the world meeting this week in the Spanish capital will attempt to agree on a global definition of the word "terrorism" and recommend measures on how to fight it.

The International Summit on Democracy, Terrorism and Security organised by the Club of Madrid is bringing together some 200 experts and political leaders, including heads of state and former presidents, Tuesday through Friday.

The Club of Madrid, whose members include 50 former heads of state and government, describes itself as an independent organisation dedicated to fomenting and strengthening democracy around the world.