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non·syn·chro·nous | \ ˌnän-ˈsiŋ-krə-nəs 
, -ˈsin- \
, -ˈsin- \Definition of nonsynchronous
: not synchronous : not happening, moving, or existing at the same time
Such nonsynchronous rotation had originally been proposed as a consequence of a supposed lack of permanent mass asymmetry within a dominantly fluid Europa …— William B. McKinnon Any camera and recorder can be used to record nonsynchronous, double system sound …— Edward Pincus and Steven Ascher nonsynchronous assembly lines
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The first known use of nonsynchronous was in 1830
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