hi

interjection

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

adjective

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

interjection

1. an expression used to attract attention

abbreviation for

1. Hawaii (state)
2. Hawaiian Islands