Main definitions of hi in US English:

: hi1HI2

hi1

exclamation

informal
  • Used as a friendly greeting or to attract attention.

    ‘“Hi there. How was the flight?”’
    • ‘‘Hi, is Danielle there?’ asked a guy's voice.’
    • ‘I'd just like to say hi to my friends and family back home.’
    • ‘Hi, Jessica, how are you?’
    • ‘Hi there everyone. My name's Jeb.’

Origin

Natural exclamation: first recorded in late Middle English.

Pronunciation

hi

/hī//haɪ/

Main definitions of hi in US English:

: hi1HI2

HI2

abbreviation

  • Hawaii (in official postal use).