1. simultaneous operation the simultaneous execution of two or more operations
  2. alliteration use of the same consonant at the beginning of each word
  3. simultaneous equations a set of equations in two or more variables for which there are values that can satisfy all the equations simultaneously
  4. spontaneous abortion a natural loss of the products of conception
  5. synchronous operation operations that are initiated predictably by a clock
  6. spontaneous generation a hypothetical organic phenomenon by which living organisms are created from nonliving matter
  7. simultaneously at the same instant
  8. military operation activity by a military or naval force
  9. sting operation a complicated confidence game planned and executed with great care (especially an operation implemented by undercover agents to apprehend criminals)
  10. cellular respiration the metabolic processes whereby certain organisms obtain energy from organic molecules; processes that take place in the cells and tissues during which energy is released and carbon dioxide is produced and absorbed by the blood to be transported to the lungs
  11. asynchronous operation operations that occur without a regular or predictable time relation to other events
  12. simultaneous occurring or operating at the same time
  13. multiplex operation an operation in which two or more activities are interleaved
  14. amphibious operation a military operation by both land and sea forces
  15. inspiration arousal of the mind to unusual activity or creativity
  16. simultaneousness happening or existing or done at the same time
  17. spontaneous combustion ignition of a substance (as oily rags) resulting from an internal oxidation process
  18. intelligence operation the operation of gathering information about an enemy
  19. sex-change operation surgical procedures and hormonal treatments designed to alter a person's sexual characteristics so that the resemble those of the opposite sex
  20. boolean operation an operation that follows the rules of Boolean algebra

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