in ‧ stan ‧ ta ‧ ne ‧ ous /ˌɪnstənˈteɪniəs◂/ BrE AmE adjective
[ Word Family: noun : ↑ instance , ↑ instant ; adverb : ↑ instantly , ↑ instantaneously ; adjective : ↑ instant , ↑ instantaneous ]
happening immediately:
modern methods of instantaneous communication
—instantaneously adverb