OF meaning in Regional ?

Answer:

What is Old French mean?

Old French (franceis, françois, romanz; Modern French: ancien français) was the language spoken in Northern France from the 8th century to the 14th century. Rather than a unified language, Old French was really a linkage of Romance dialects, mutually intelligible yet diverse, spoken in the northern half of France.

In the 14th century, these dialects came to be collectively known as the langue d'oïl, contrasting with the langue d'oc in the south of France. During the mid-14th century, one of the dialects of Old French, namely Francien from Île-de-France area, transitioned to Middle French, the language of the French Renaissance – itself a predecessor to modern French. As for other components of Old French, they evolved into various modern languages (Poitevin-Saintongeais, Gallo, Norman, Picard, Walloon, etc.), each with its own linguistic features and history.

The region where Old French was spoken natively roughly extended to the northern half of the Kingdom of France and its vassals (including parts of the Angevin Empire, which during the 12th century remained under Anglo-Norman rule), and the duchies of Upper and Lower Lorraine to the east (corresponding to modern north-eastern France and Belgian Wallonia), but the influence of Old French was much wider, as it was carried to England and the Crusader states as the language of a feudal elite and commerce.

reference

Full Form	Category
Portuguese Pharmaceutical Society	Academic & Science
Ordem dos Farmacêuticos	Academic & Science
Olive Fork	Business
Oxygen Free	Chemistry
Odd Future	Community
Oriental Female	Community
Otechestven Front	Community
Overflow Flag	Computer Assembly Language
Output File	Computing
Optical Fiber	Electronics
Operations and Food	Governmental
Opportunity Fuel	Governmental
Operational Forward	Governmental
Operational Instrumentation MDM (Manipulator Deployment Mechanism) -Forward	Governmental
OriginalFassung	International
OnlyFans	Internet
Older Fellow	Jobs
Outfielder	Jobs
Ordered Field	Maths
Obliquity Factor	Medical
Open Field	Medical
Operating Framework	Medical
orbitofrontal	Medical
Organ Failure	Medical
Osmotic Fragility	Medical
Ossifying Fibroma	Medical
Oxidation Fermentation	Medical
Operation Flood	Medical
Operational Factor	Medical
On Fleek	Messaging
Opposing Force	Military and Defence
Officer (nato)	Military and Defence
Objective Force	Military and Defence
Optional Form	Military and Defence
Old French	Regional
Open File	Softwares
Operational Fwd Dsc Or Mdm	Space Science
Operational Instrumentation Mdm-fwd	Space Science
Orbital Flight	Space Science
Outside Face	Space Science
Oxidizer-to-fuel Ratio	Space Science
Oxygen Fill	Space Science
Order Form	Space Science
Outfield	Sports
Oppenheimer Funds	Stock Exchange