INTERPLANETARY Meaning of INTERPLANETARY in English interplanetary BrE AmE ˌɪnt ə ˈplæn ɪt‿ ə r i ◂ -ˈ•ət‿ AmE \ ˌɪn t̬ ə r ˈplæn ə ter i Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012