Definitions of organisation:

noun: the activity or result of distributing or disposing persons or things properly or methodically
noun: the act of organizing a business or business-related activity
noun: an ordered manner; orderliness by virtue of being methodical and well organized
noun: a group of people who work together
noun: an organized structure for arranging or classifying
noun: the act of forming something
noun: the persons (or committees or departments etc.) who make up a body for the purpose of administering something