Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym OIO is...

OIO is

Object Input/ Output
Open Infrastructure For Outcomes

More Meanings For OIO:

Object Input/ Output
Open Infrastructure For Outcomes
Onderzoeker In Opleiding (PhD student; Research worker in training)
Office Inventory Ordering
Opportunities In Options
Office Of The Insurance Ombudsman

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