1. Oakley

2. OASIS (Organization for the Advancement of Structured Information Standards)

3. object

4. object class

5. object code

6. object database

7. object handle

8. object library

9. object module

10. object program

11. object technology

12. Objective-C

13. object-oriented analysis

14. object-oriented database

15. object-oriented design

16. object-oriented font

17. object-oriented graphics

18. object-oriented technology

19. OC (Optical Carrier)

20. Occam’s razor

21. OCR (Optical Character Recognition)

22. octal

23. octet

24. OCX (Object Embedding and Linking Control)

25. ODBC (Open Database Connectivity)

26. ODBMS (Object-oriented DBMS)

27. Odin

28. ODR (Online Dispute Resolution)

29. OEM (Original Equipment Manufacturer)

30. OFDM (Orthogonal FDM)

31. office automation

32. offline

33. off-line debit card

34. off-line debit card system

35. offset (1)

36. offset (2)

37. offset (3)

38. OFX (Open Financial Exchange)

39. Ogg Vorbis

40. OGM (OGg Media)

41. OGSS (Ordered Grid Super-Sampling)

42. OIA

43. OIC (Oh, I see)

44. OID (Object IDentifier)

45. oil card

46. OIRT (Organisation Internationale de Radiodiffusion et de Télévision)

47. OLAP (OnLine Analytical Processing)

48. OLE (Object Linking and Embedding)

49. OLE DB (OLE DataBase)

50. OLED (Organic Light Emitting Device, Organic Light Emitting Diode)

51. OLL (Online love)

52. OLTP (On-Line Transaction Processing)

53. OM1 (Open MPEG-1)

54. OMA (Object Management Architecture)

55. OMC (Operation and Maintenence Center)

56. OMG (Object Management Group)

57. Omniweb

58. ONC (Open Network Computing)

59. on-demand TV

60. one-line phone

61. one-way hash function

62. online broker

63. online processing

64. online service, on-line service

65. online storefront

66. online, on-line

67. OODB (Object-Oriented DataBase)

68. OOK (On-Off Keying)

69. OOP (Object-Oriented Programming)

70. open (1)

71. open (2)

72. Open CV (OPEN Source Computer Vision)

73. Open EDI

74. open format

75. Open Market

76. open relay

77. open source (1)

78. Open Source (2)

79. Open Source Definition

80. open standards

81. open systems

82. open video system

83. OpenAL (OPEN Audio Library)

84. OpenBSD

85. OpenDoc Standard

86. OpenGL

87. OpenLDI (OPEN LVDS Digital Interface)

88. OpenLook

89. OpenStep

90. OpenVMS

91. Opera

92. operand

93. operation (1)

94. operation (2)

95. operation code

96. operator (1)

97. operator (2)

98. OPI (Open Prepress Interface)

99. OPS (Open Profiling Standard)

100. Opteron

101. optical disk

102. optical disk library

103. optical fiber

104. option

105. optional

106. OQPSK (Offset Quadrature Phase-Shift Keying)

107. OR

108. Oracle

109. Oracle E-Business Suite

110. Orange Book

111. ORB (Object Request Broker)

112. orkut

113. orthogonal

114. orthogonal code

115. orthogonal instruction set

116. OS (Operating System)

117. OS/2

118. OS/2 Warp

119. OS/390

120. OS/400

121. OS-9

122. OSD (Open Software Description)

123. OSD (On-Screen Display)

124. OSD (On-Screen-Display)

125. OSF (Open Software Foundation)

126. OSI (Open Source Initiative)

127. OSI (Open Systems Interconnection) architecture

128. OSINT (open-source intelligence)

129. OSP (Online Service Provider)

130. OSP (2) (Office Service Provider)

131. OSPF (Open Shortest Path First)

132. OT (Operator Terminal)

133. OTA (Over The Air) television

134. OTG (Operations and Technology Group)

135. OTOH (On the other hand)

136. OTP (One Time Pad)

137. OTP (One Time Programmable)

138. OTP (One-Time Password system)

139. OTP (Open Trading Protocol)

140. outbox

141. outline (1)

142. outline (2)

143. outline font

144. outline view

145. out-of band signaling

146. output device

147. overclocker

148. overclocking

149. overflow

150. overhead

151. overlaid windows

152. overlay network

153. overwrite (1)

154. overwrite (2)

155. OWA (Outlook Web Access)