1. (used as an exclamation of greeting); hello!


  1. an informal, simplified spelling of high: hi fidelity.

  1. Hawaii (approved especially for use with zip code).

  1. Hawaiian Islands.
  2. Meteorology. heat index.

sentence substitute

  1. an informal word for hello


  1. an expression used to attract attention

abbreviation for

  1. Hawaii (state)
  2. Hawaiian Islands

greeting, 1862, American English (first recorded reference is to speech of a Kansas Indian), originally to attract attention (15c.), probably a variant of Middle English hy, hey (late 15c.) also an exclamation to call attention. Extended form hiya attested from 1940.

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