Definition of definition for English Language Learners. : an explanation of the meaning of a word, phrase, etc. : a statement that defines a word, phrase, etc. : a statement that describes what something is.
An IBAN (International Bank Account Number) is an international bank account identifier used to uniquely identify the account of a customer at a financial institution. This is the only permissible account identifier for SEPA payments.
CTBAAU2S is a SWIFT code not an IBAN. An IBAN is an international bank account number which includes banking information and a beneficiary's account number. Australian Banks do not use an IBAN; they use a 6-digit BSB code + account number.