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- O: 79 terms
- Object and scope of sociology
- Objects in worship. Furnishings and decorations
- Observation and recording of phenomena. Visual indication of phenomena
- Occupational health hazards. Occupational health and hygiene
- Occupations and activities associated with music
- Occupations and activities associated with the arts and entertainment
- Oceanic Ancestry Group
- Oceanic languages
- Oceans, seas and interconnections
- Offences against fundamental liberties, human rights
- Offences against public credit, morality, the family
- Offences against the person
- Offences against the state
- Oils, fats and waxes of animal origin
- Oils. Fats. Waxes. Adhesives. Gums. Resins
- Old period. Archaic period
- Old period. Archaic period
- Old persons. Persons in old age. Senior citizens
- Oman. Sultanate of Oman. Salṭanat ʻUmān
- Omotic languages
- One-dimensional. Lines
- Online computing systems for specific use
- Opening up of territories. Colonization. Colonialism
- Operation and control of machines and processes
- Operational properties
- Operational research (OR)
- Operational research (OR): mathematical theories and methods
- Ophthalmology. Eye disorders and treatment
- Optical apparatus and instruments
- Optics
- Oratory. Speeches
- Order-fixing (double colon sign). Table 1b
- Ore and other mineral deposits. Natural resources
- Ore deposits (metalliferous mineral deposits) in general. Iron and manganese ores
- Ore deposits other than iron and manganese
- Ore formation. Mineral formation
- Organic chemistry
- Organic minerals
- Organization of instruction
- Organization of science and scientific work
- Organization of sport, in general
- Organizational behaviour. Management psychology
- Organizational management (OM)
- Organizational structure of the faith, religion
- Organizations and other types of cooperation
- Organizations of a general nature
- Organizations with humanitarian, philanthropic aims
- Orientation. Points of the compass. Relative position
- Origin, evolution and domestication of animals kept by humans. Taming of animals. Biological bases of rearing and training
- Originator, founder, central figure of the faith
- Origins, precursors of scripts. Early forms of scripts
- Ornamentals. Decorative plants. Ornamental gardening
- Orthodox Judaism
- Orthopaedics in general
- Other animal contests, e.g. with birds
- Other animals kept by humans
- Other Australian languages
- Other commercial activities
- Other compounds of oxyacids
- Other green vegetables. Leaf vegetables
- Other Indo-Pacific languages
- Other kinds of graphic representation of thought
- Other kinds of song
- Other marine products
- Other materials
- Other non-serial separates
- Other physico-mechanical effects
- Other plants with industrial uses
- Other precious, remarkable or rare printed works
- Other protestant churches
- Other pulp fruits
- Other regions. Ancient geographical divisions other than those of classical antiquity
- Other religious texts
- Other terms descriptive of relationships between entities
- Other waterway protection and improvement works. Dykes. Coast protection. Land drainage and reclamation
- Outdoor games and recreation
- Outer clothing. Tailoring
- Outlying Islands in the South Indian and South Atlantic Oceans
- Oxygen compounds