self-propulsion

noun
self-pro·pul·sion | \ ˌself-prə-ˈpəl-shən \

Definition of self-propulsion 

: propulsion by one's own power

First Known Use of self-propulsion

1874, in the meaning defined above

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The first known use of self-propulsion was in 1874

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occurring twice a year or every two years

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