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Oct or OCT is a common abbreviation for October, the 10th month of the year in the Julian and Gregorian calendars. It may also refer to:

Eight (Latin-derived prefix)

• A prefix meaning eight
• Octal, the numeral system
• Octans, a constellation
• Octave (electronics), a relative unit of frequency

Medicine

• Obsessive compulsive tendencies, a criterion involved in the diagnosis of obsessive-compulsive disorder
• Oncology clinical trial, a clinical trial in cancer research
• Oxytocin challenge test, a type of contraction stress test in late stage pregnancy

Science and technology

• Odd cycle transversal in graph theory
• Office of the Chief Technologist, a manager at the NASA Institute for Advanced Concepts
• Olefin conversion technology
• Optical coherence tomography, an imaging method
• Optimal cutting temperature compound, a process in medicine
• Organic cation transport protein, a type of protein
• Orion correlation theory, a hypothesis in pyramidology

Other

• Office Customisation Tool, available in some versions of Microsoft Office 2007
• Ontario Certified Teacher, a professional designation
• Orangi Charitable Trust, a microfinance organisation in Karachi, Pakistan
• Overseas Chinese Town, (narrowly) a theme park or (broadly) an area in Shenzhen, Guangdong, China
  • Overseas Chinese Town Limited The company that operate Shenzhen Overseas Chinese Town and other theme parks in China
• Overseas countries and territories, non-sovereign countries and territories not part of the European Union, that have a special relationship with a European Union member state
• Oxford Classical Texts
• Oklahoma City Thunder (OCT)

See also

• OTC (disambiguation)

• Disambiguation pages