1. spontaneous generation a hypothetical organic phenomenon by which living organisms are created from nonliving matter
  2. spontaneous abortion a natural loss of the products of conception
  3. spontaneous combustion ignition of a substance (as oily rags) resulting from an internal oxidation process
  4. subcutaneous injection an injection under the skin
  5. simultaneous operation the simultaneous execution of two or more operations
  6. spontaneousness the quality of being spontaneous and coming from natural feelings without constraint
  7. cutaneous sensation a sensation localized on the skin
  8. beat generation a United States youth subculture of the 1950s
  9. wind generation power derived from the wind (as by windmills)
  10. buy-and-bust operation an undercover operation by narcotics detectives to catch unsuspecting drug dealers
  11. printing operation an operation that controls the printing or display of information
  12. simultaneous equations a set of equations in two or more variables for which there are values that can satisfy all the equations simultaneously
  13. sting operation a complicated confidence game planned and executed with great care (especially an operation implemented by undercover agents to apprehend criminals)
  14. synchronous operation operations that are initiated predictably by a clock
  15. baby-boom generation the larger than expected generation in United States born shortly after World War II
  16. spontaneously in a spontaneous manner
  17. States General assembly of the estates of an entire country especially the sovereign body of the Dutch republic from 16th to 18th centuries
  18. degeneration the process of declining from a higher to a lower level
  19. hepatolenticular degeneration a rare inherited disorder of copper metabolism
  20. spontaneous said or done without having been planned in advance

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