Hi vs. Hai: What's the Difference?

Hi and Hai Definitions
Hi
Used to express greeting. See Note at hey.
Hai
(Internet slang) hi
Hi
A friendly, informal, casual greeting said upon someone's arrival.
Hi, how are you?
I just dropped by to say “hi”.
Hi
An exclamation to call attention.
Hi
(dated) Expressing wonder or derision.
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Hi
The word "hi" used as a greeting.
I didn't even get a hi.
Hi
Informal spelling of high, often in hyphenated terms.
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Hi
An expression of greeting;
Every morning they exchanged polite hellos
Hi
A state in the United States in the central Pacific on the Hawaiian Islands