UNESCO Thesaurus

  1. Oases
  2. Obesity
  3. Observation
  4. Obstacles to development
  5. Occultism USE Spiritualism
  6. Occupational change USE Occupational mobility
  7. Occupational choice
  8. Occupational diseases
  9. Occupational guidance USE Vocational guidance
  10. Occupational health USE Occupational diseases
  11. Occupational life USE Working life
  12. Occupational medicine
  13. Occupational mobility
  14. Occupational psychology
  15. Occupational qualifications
  16. Occupational safety
  17. Occupational satisfaction USE Job satisfaction
  18. Occupational sociology
  19. Occupational status
  20. Occupational therapy USE Occupational medicine
  21. Occupational training USE Vocational training
  22. Occupations
  23. Occupied territories
  24. Ocean circulation
  25. Ocean currents
  26. Ocean dynamics USE Dynamic oceanography
  27. Ocean engineering USE Marine engineering
  28. Ocean environment USE Marine environment
  29. Ocean expeditions USE Ocean exploration
  30. Ocean exploration
  31. Ocean floor
  32. Ocean stations
  33. Ocean wave energy USE Tidal energy
  34. Ocean waves
  35. Oceania
  36. Oceanic art
  37. Oceanic cultures
  38. Oceanic literature
  39. Oceanographic buoys
  40. Oceanographic data
  41. Oceanographic equipment
  42. Oceanographic instruments USE Oceanographic equipment
  43. Oceanographic laboratories
  44. Oceanographic measurement
  45. Oceanographic research
  46. Oceanography
  47. Oceanography education USE Marine education
  48. Oceanology USE Oceanography
  49. Oceans
  50. OCR USE Character recognition
  51. OECD countries
  52. OER USE Open educational resources
  53. Office automation
  54. Office equipment
  55. Office machines USE Office equipment
  56. Office management
  57. Office services
  58. Office workers
  59. Official archives USE Government archives
  60. Official publications
  61. Offset printing
  62. Offshore drilling USE Sea bed mining
  63. Oil industry USE Petroleum industry
  64. Oil pollution
  65. Oil resources USE Petroleum resources
  66. Old age
  67. Olympic Games
  68. Oman
  69. Ombudsman
  70. On the job training USE Inservice training
  71. One parent families
  72. One teacher schools
  73. Online governance USE Electronic governance
  74. Online information retrieval USE Online searching
  75. Online information systems
  76. Online learning USE Electronic learning
  77. Online public access catalogues USE Catalogues
  78. Online searching
  79. Online systems
  80. Ontology
  81. OPAC USE Catalogues
  82. Open area schools USE Open plan schools
  83. Open courseware USE Open educational resources
  84. Open educational resources
  85. Open learning systems USE Distance education
  86. Open plan schools
  87. Open source software
  88. Open spaces
  89. Open teaching/learning resources USE Open educational resources
  90. Open universities
  91. Opera
  92. Operating systems USE Computer software
  93. Operations research
  94. Ophthalmology
  95. Opinion surveys USE Public opinion polls
  96. Opium USE Narcotic drugs
  97. Oppression
  98. Optical character recognition USE Character recognition
  99. Optical discs
  100. Optical fibres
  101. Optical instruments
  102. Optics
  103. Optimization
  104. Optional courses USE Elective courses
  105. Oral examinations
  106. Oral expression
  107. Oral history
  108. Oral literature USE Folk literature
  109. Oral reading
  110. Oral tradition
  111. Orchestras
  112. Ore deposits USE Mineral deposits
  113. Organ transplantation
  114. Organic chemistry
  115. Organic compounds
  116. Organic matter
  117. Organization and management
  118. Organization and methods
  119. Organization of research
  120. Organizational change
  121. Organizational structure USE Administrative structure
  122. Organizations
  123. Oriental art USE Asian art
  124. Oriental cultures USE Asian cultures
  125. Oriental languages USE Asian languages
  126. Orientation courses
  127. Oriya
  128. Ornithology
  129. Orphanages USE Residential child care
  130. Orphans
  131. Orthography USE Spelling
  132. Out of school education
  133. Out of school youth
  134. Outdoor education
  135. Outer space USE Space
  136. Overachievers USE Gifted students
  137. Overpopulation
  138. Oxygen
  139. Ozone
  140. Ozone depletion