Hi Definition

hī

interjection

Used to express greeting.

American Heritage

Hello.

Webster's New World

A friendly, informal, casual greeting said when meeting someone.

Hi, how are you?

I just dropped by to say “hi”.

Wiktionary

An exclamation to call attention.

Wiktionary

abbreviation

Hawaii.

Webster's New World

High intensity.

American Heritage

Humidity index.

American Heritage

Hawaii, a state of the United States of America.

Wiktionary

adjective

Webster's New World

Informal spelling of high, often hyphenated.

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Next, set the burner to hi.

Wiktionary

noun

"Hi" or similar greeting.

Wiktionary

Synonyms:

Origin of Hi

American English (first recorded reference is to speech of a Kansas Indian), originally to attract attention, probably a variant of Middle English hy, hey (circa 1475) also an exclamation to call attention.

From Wiktionary