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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 (RO) is the opposite of a natural process simply called osmosis. Osmosis is the movement of water molecules across a semipermeable membrane. The process naturally moves water from a low ion concentration to a higher ion concentration across a semipermeable membrane.