1. a group of people who work together for a particular purpose
Usage: British spelling
2. the way in which something is arranged or structured
Usage: British spelling
3. the act or process of organizing something
Usage: British spelling

Examples

• She works for a charitable organisation that helps homeless people.
• The World Health Organisation monitors global health issues.
• The organisation of the conference took months of planning.
• His desk showed a complete lack of organisation.
• The organisation of the company’s files needs improvement.
• They formed an organisation to protect local wildlife.
• The organisation of the event was handled by volunteers.