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1. A call for response if it is not clear whether anyone is present or listening
   - hello, hullo
    
2. Used sarcastically to imply that something is foolish or unrealistic
   - hello, hullo
    
3. Used as a greeting
   - aloha [US, informal], g'day [Austral, informal], greetings, hi [informal], hello, hiya [informal], hullo, hey [informal], howdy [informal], howzit [S.Africa, informal], gidday [NZ, informal], yo [informal], wotcha [Brit, informal], wotcher [Brit, informal]

1. An expression of greeting
   "every morning they exchanged polite hallos";
   - hello, hullo, hi, howdy, how-do-you-do

Derived forms: hallos

Type of: greeting, salutation

Encyclopedia: Hallo, Onkel Doc!