| OECD |
| The Organisation for Economic Co-operation and Development. |
| OEICs |
| Open-Ended Investment Companies. |
| ON BOARD |
| Notation appearing on a Bill of Lading indicating that a cargo has been loaded on board the vessel. |
| OPEN ACCOUNT |
| Terms of trade usually involving invoicing but no additional security for payment. Typically between longstanding counterparties. |
| OPENING BANK |
| A bank which issues a Letter of Credit on behalf of a customer or Applicant. Also known as the Issuing Bank. |
| OPINION |
| Colloquial term for "legal opinion". |
| OUTS / OUT COUNTRIES |
| The 4 EU countries which were not included in the EMU area in the first round of membership in May 1998. They are Denmark, Greece, Sweden and the UK. |
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