mwīriwe    n    1. good afternoon, good evening, 2. hello (in afternoon/evening, greeting used when meeting for second time same day)
afternoon    inyuma ya sasita, ku muhīngamo, umuhīngamo
(late, early evening) umugorōba, akagorōba
(good afternoon!) mwīriwe
En-En dictionary 
hello    (morning) bwakeye
(afternoon) mwīriwe
(informal) yambu, bite, amaho, gute, gute none, vyifashe gute
En-En dictionary 
good evening   mwīriwe (used any time during the day or evening when greeting one after first time)
En-En dictionary