Organisation and organization mean the same thing. They are alternative spellings of the same word, both being used in British English and only one being used in American English.

An organization or organisation (Commonwealth English; see spelling differences) is an entity —such as a company, or corporation or an institution (formal organization), or an association …

The meaning of ORGANIZATION is the act or process of organizing or of being organized. How to use organization in a sentence.

Meaning of organization in English organization noun (UK usually organisation) uk / ˌɔː.ɡ ə n.aɪˈzeɪ.ʃ ə n / us / ˌɔːr.ɡ ə n.əˈzeɪ.ʃ ə n /

[countable] a group of people who form a business, club, etc. together in order to achieve a particular aim. She's the president of a large international organization. He works with local …

An organization is a group of people who work together, like a neighborhood association, a charity, a union, or a corporation. You can use the word organization to refer to group or …

She is responsible for the organization of the party. The new president plans to make changes to the company's organization. You have a lot of good ideas in this paper, but there's no …