adj 1 a  :  arising sporadically or in other than the usual location <an part in embryonic development>   b  :  occurring spontaneously or accidentally in a country or region to which it is not native <an insect>   2  :  ADVENTITIAL  3  :  not congenital < deafness>  ad*ven*ti*tious*ly adv 
 
 
 
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