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| Italian | English |
| gruppo di lavoro Open Ended | Open-Ended Working Group |
| inquinamento ad opera dei biocidi | biocide pollution |
| inquinamento ad opera di biocidi | biocide pollution |
| opera d'arte | engineering work No definition needed |
| opera di riassetto dopo una catastrofe | disaster cleanup operation A course or procedure of activity designed to clear the debris or remove harmful substances left by an ecological calamity, natural or human in origin, in a given area |
| opera di riassetto dopo una catastrofe | disaster cleanup operation |