We found 18 dictionaries that define the word authorisation:

General (14 matching dictionaries)

1. authorisation: Merriam-Webster
2. authorisation: Collins English Dictionary
3. authorisation: Vocabulary.com
4. Authorisation, authorisation: Wordnik
5. authorisation: Cambridge Advanced Learner's Dictionary
6. authorisation: Wiktionary
7. authorisation: Dictionary.com
8. authorisation: Rhymezone
9. authorisation: FreeDictionary.org
10. authorisation: Mnemonic Dictionary
11. authorisation: TheFreeDictionary.com
12. authorisation: Merriam-Webster

Business (1 matching dictionary)

13. authorisation: Legal dictionary

Computing (2 matching dictionaries)

14. Data Formats and Their Sugggested File Extensions (No longer online)
15. authorisation: Encyclopedia

Medicine (1 matching dictionary)

16. authorisation: Medical dictionary

(Note: See authorisations as well.)

Definitions from Wiktionary ( ) ▸ noun:  Non-Oxford British English standard spelling of authorization. [(countable) An act of authorizing.] Similar: empowerment, authorization, authorised, licence, approval, permission, authentication, authentification, countersignature, unauthorised, more... Opposite: unauthorized, prohibited, forbidden, illegal, unapproved Phrases: authorisation procedure, Registration, Evaluation, Authorisation and Restriction of Chemicals, European Travel Information and Authorisation System, Marketing authorisation, Porting Authorisation Code, more... Adjectives: prior, such, special, official, necessary, specific, written, formal, previous, proper, general Colors:     royal blue,     midnight blue,     steel blue,     slate gray,     charcoal, more... ▸ Words similar to authorisation ▸ Usage examples for authorisation ▸ Idioms related to authorisation ▸ Wikipedia articles (New!) ▸ Popular adjectives describing authorisation ▸ Words that often appear near authorisation ▸ Rhymes of authorisation ▸ Invented words related to authorisation