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ORN abbr.
abbr.	Operation Rescue National; Office Registration Number (Johnny Bravo)
abbr., el.	optical remote node; output reconfiguration network
abbr., inet.	Obligatory Running Note
abbr., transp.	Olympic Route Network (slitely_mad)
airports, avia.	Oran, Algeria
orn abbr.
abbr.	orange; ornament
abbr., med.	ornithologist
orn. abbr.
abbr.	ornamentation
Orn abbr.
abbr., med.	ornithine (or its radical)