• Obstruction theory
  Obstruction theory
  In mathematics, obstruction theory is a name given to two different mathematical theories, both of which yield cohomological invariants.-In homotopy theory:...
  
  , in mathematics
• Obstruction of justice
  Obstruction of justice
  The crime of obstruction of justice, in United States jurisdictions, refers to the crime of interfering with the work of police, investigators, regulatory agencies, prosecutors, or other officials...
  
  , the crime of interfering with law enforcement
• Obstructing government administration
  Obstructing government administration
  A person is guilty of obstructing government administration if the person intentionally interferes by force, violence or intimidation or by any physical act with a public servant performing or purporting to perform an official function.-External links:...
  
  
• Propagation path obstruction
  Propagation path obstruction
  In telecommunication, a propagation path obstruction is a man-made or natural physical feature that lies near enough to a radio path to cause a measurable effect on path loss, exclusive of reflection effects. An obstruction may lie to the side, above, or below the path. Ridges, bridges, cliffs,...
  
  
  • Single Vegetative Obstruction Model
    Single Vegetative Obstruction Model
    The ITU Single Vegetative Obstruction Model is a Radio propagation model that quantitatively approximates the attenuation due to the vegetation in the middle of a telecommunication link.-Applicable to/under conditions:...
    
    

Medical

• Obstructive jaundice
• Obstructive sleep apnea
  Obstructive sleep apnea
  Obstructive sleep apnea or obstructive sleep apnea syndrome is the most common type of sleep apnea and is caused by obstruction of the upper airway. It is characterized by repetitive pauses in breathing during sleep, despite the effort to breathe, and is usually associated with a reduction in...
  
  
• Airway obstruction
  Airway obstruction
  Airway obstruction is a respiratory problem caused by increased resistance in the bronchioles that reduces the amount of air inhaled in each breath and the oxygen that reaches the pulmonary arteries...
  
  , a respiratory problem
  • Recurrent airway obstruction
    Recurrent Airway Obstruction
    Recurrent airway obstruction, also known as broken wind, heaves, or sometimes by the term usually used for humans , is a respiratory disease in horses...
    
    
• Bowel obstruction
  Bowel obstruction
  Bowel obstruction is a mechanical or functional obstruction of the intestines, preventing the normal transit of the products of digestion. It can occur at any level distal to the duodenum of the small intestine and is a medical emergency...
  
  , a blockage of the intestines.
• Gastric outlet obstruction
  Gastric outlet obstruction
  Gastric outlet obstruction is a medical condition where there is an obstruction at the level of the pylorus, which is the outlet of the stomach. Individuals with gastric outlet obstruction will often have recurrent vomiting of food that has accumulated in the stomach, but which cannot pass into...
  
  
• Distal intestinal obstruction syndrome
  Distal intestinal obstruction syndrome
  Distal intestinal obstruction syndrome involves blockage of the intestines by thickened stool and occurs in individuals with cystic fibrosis. DIOS was previously known as meconium ileus equivalent, a name which highlights its similarity to the intestinal obstruction seen in newborn infants with...
  
  
• Congenital lacrimal duct obstruction
  Congenital lacrimal duct obstruction
  Congenital nasolacrimal duct obstruction is the condition in which a tear duct has failed to open at the time of birth. Around 6% of infants have CLDO, usually experiencing a persistent watery eye even when not crying. The condition is also known as dacryostenosis...
  
  

Sports

• Obstruction (baseball)
  Obstruction (baseball)
  In baseball, when a fielder illegally hinders a baserunner, the fielder is guilty of obstruction.Baserunners are generally permitted the free privilege to run from base to base without being physically blocked or hindered by a fielder...
  
  , when a fielder illegally hinders a baserunner
• Obstructing the field
  Obstructing the field
  Obstructing the field is a rare method of dismissal in the sport of cricket.-Definition:Law 37 of the Laws of cricket provides that:"Either batsman is out Obstructing the field if he wilfully obstructs or distracts the opposing side by word or action...
  
  

Other

• The Five Obstructions
  The Five Obstructions
  The Five Obstructions is a 2003 Danish film by Lars von Trier and Jørgen Leth. The film is a documentary, but incorporates lengthy sections of experimental films produced by the filmmakers. The premise is that Lars von Trier has created a challenge for his friend and mentor, Jørgen Leth, another...
  
  , a 2003 film
• Obstruction Island (Washington)
  Obstruction Island (Washington)
  Obstruction Island is one of the San Juan Islands in San Juan County, Washington, USA. It lies off the southeast tip of Orcas Island, between it and Blakely Island. Obstruction Island has a land area of 0.882 km² . The 2000 census reported a permanent population of eight...
  
  
• Emergency Workers (Obstruction) Act 2006
  Emergency Workers (Obstruction) Act 2006
  The Emergency Services Act 2006 is an Act of the Parliament of the United Kingdom. It is intended to reduce the instances of obstruction of, or assaults, on emergency service personnel.Sections 1 to 6 came into force on 20 February 2007....