Orthopedic Foundation for Animals. An organization which maintains a registry of hip and elbow data to help determine that joint confirmation is ideal and free of hereditary defects. Typical OFA hip ratings, in order of preference are: Excellent and Good followed by Fair. Initially spawned in an effort to curb the prevalence of Hip Displasia occuring in many large breed dogs.

Orthopedic Foundation For Animals. Certification for hips, elbows, patella, thyroid, cardiac.

Orthopedic Foundation for Animals; canine radiologists rate and certify x-rays of hips and elbows after the age of 24 months. A basic requirement prior to mating.

Runway Object Free Area

Obstacle Free Area. A two dimensional ground area surrounding runways, taxiways, and taxilanes which is clear of objects except for objects whose location is fixed by function.

Open Frontal Area. In monolith catalyst substrates, the part of the total substrate cross-section area which is available for the flow of gas. The OFA is frequently expressed as a percentage of the total substrate cross-section and sometimes also called the substrate void fraction.

Optimal Flexible Architecture. A set of file naming and placement guidelines for Oracle software and databases.

See Optimal Flexible Architecture.

Office of Financial Aid

Office for the Aging

Office of Family Assistance

Organic Federation of Australia