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Here are all the possible meanings and translations of the word RO. Princeton's WordNet(0.00 / 0 votes)Rate this definition: Ro(noun) an artificial language for international use that rejects all existing words and is based instead on an abstract analysis of ideas.
Reverse Osmosis, commonly referred to as RO, is a process where you demineralize or deionize water by pushing it under pressure through a semi-permeable Reverse Osmosis Membrane. To understand the purpose and process of Reverse Osmosis you must first understand the naturally occurring process of Osmosis.