Longman Dictionary of Contemporary English - organize

also -ise BrE v 1 to make the necessary arrangements so that an activity can happen  (They organized a protest march. | Who's going to organise the party this year?) 2 to arrange information, work, a group etc so that it works correctly  (Organize your thoughts before you begin to speak. | A team of professionals will organize the volunteers. | be organized in/along/around)  (The political system is organized along party lines. | industrial towns organized around places of work) 3 especially AmE to form a trade union (=an organization that protects workers' rights) or persuade people to join one; unionize