hello hello /hɛˈloʊ/

interjection

1. () A call to verify the presence of someone or to get their attention when unsure if they are listening or around.  ( hello , hullo , hallo )
   A call to verify the presence of someone or to get their attention when unsure if they are listening or around.
   
2. () Sarcastically used to highlight perceived folly or impracticality in another's statement.  ( hello , hullo , hallo )
   Sarcastically used to highlight perceived folly or impracticality in another's statement.
   
3. () Words or phrases commonly used to acknowledge someone upon meeting or greeting.  ( g'day [Informal, Australian] , gidday [Informal, New Zeland] , howzit [Informal, South Africa] , aloha [Informal, American] , hello , hi [Informal] , howdy [Informal] , hullo , greetings , hallo , hey [Informal] , hiya [Informal] , wotcha [Informal, British] , wotcher [Informal, British] , yo [Informal] )
   Words or phrases commonly used to acknowledge someone upon meeting or greeting.
   

noun

1. () An expression of greeting  ( how-do-you-do , howdy , hullo , hello , hi )
   an expression of greeting
    Every morning they exchanged polite hellos
   every morning they exchanged polite hellos