UK objective assessment
US, CA objective test
UK objective test
UK occasional student
US occupational course/program
UK Office of Science and Technology (OST)
ombudsman/ombudsperson
US, CA on(-)the(-)job training
UK open access
UK open admission
UK open scholarship
UK Open University
UK option
UK optional course
optional subject
UK oral
UK oral examination
US orals
UK ordinary degree
UK Ordinary National Certificate (ONC)
UK Ordinary National Diploma (OND)
US orientation course
CA out-of-school education
US out-of-state student
US outreach program
US overachiever
UK overseas student
UK Oxbridge