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• hi
  hi

  interjection

  (used as an exclamation of greeting) hello!
• HI
  HI

  abbreviation

  Hawaii (approved especially for use with zip code).
• H.I.
  H.I.

  abbreviation

  Hawaiian Islands.

hi

¹ American  

[hahy] / haɪ /

interjection

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

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hi ² American  

[hahy] / haɪ /

adjective

1. an informal, simplified spelling of high.

   hi fidelity.

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HI ³ American  

abbreviation

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

2. Meteorology. heat index. Also H.I.

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H.I. ⁴ American  

abbreviation

1. Hawaiian Islands.

2. Meteorology. heat index. Also HI

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HI ¹ British  

abbreviation

1. Hawaii (state)

2. Hawaiian Islands

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hi ² British  

/ haɪ /

1. an informal word for hello

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hi ³ British  

/ haɪ /

interjection

1. an expression used to attract attention

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Etymology

Origin of hi

First recorded in 1425–75; late Middle English hy, perhaps variant of hei hey

Explanation

Hi is a common greeting, more casual than "hello." When you walk down the street in a small town, it might seem like everyone you pass says "hi." The word hi is a good, nearly all-purpose greeting — it's appropriate in all but the most formal circumstances, so you might want to skip saying, "Hi" to the Queen when you meet her. When you greet someone, you have a lot of words to choose from, including "hey," "hello," "hiya," and "howdy," but hi is probably the most common. The first mention of hi attributes it to a Kansas native American in the 1800s.

Example Sentences

See Examples For:

hi HI H.I.

He wanted his “famous sister” to say hi to his disbelieving client.

From The Wall Street Journal ● Jul. 14, 2026

“We see them every day and we just say hi and they’re very nice,” he said.

From Los Angeles Times ● Apr. 26, 2026

“When you’re out on a run or a walk or a bike ride, do you say hi to people that pass? If you don’t, I’m not so sure about you,” he joked.

From MarketWatch ● Apr. 20, 2026

In an email from 2012, Epstein wrote to a publicist, apparently from the Cannes Film Festival, that he was "sitting next to Brett Ratner", adding: "Brett says hi and he loves you!"

From BBC ● Feb. 3, 2026

Walk in as a volunteer and say hi to everyone who waited on you as a patient.

From "It’s Kind of a Funny Story" by Ned Vizzini

HI plays a central role in this puzzle.

From Science Daily ● Sep. 3, 2026

In other words, star formation dropped dramatically without a comparable disappearance of the universe's HI reservoir.

From Science Daily ● Sep. 3, 2026

The HI Pigeon Point Lighthouse Hostel in Pescadero, California, for example, features on-site tide pools and private family rooms.

From Seattle Times ● Nov. 29, 2023

"Today's figure, although appearing okay, is already about the past while the future is getting more difficult both in terms of domestic and global demand," said Park Sang-hyun, chief economist at HI Investment & Securities.

From Reuters ● Oct. 27, 2022

Viserys had told her that the last Targaryen dragons had died no more than a century and a half ago, during the reign of Aegon HI, who was called the Dragonbane.

From "A Game of Thrones" by George R.R. Martin

The ship appears to have crewed anti-aircraft weapons on its bow and stern, according to H.I.

From Seattle Times ● May 26, 2022

My mind went to “Raising Arizona”: The first 11 minutes of that movie is this amazing narrated montage that tells you everything you know about H.I.

From New York Times ● Nov. 30, 2020

“At first, my work was difficult because many people did not want to believe that Ebola was real,” Sheku Kamara, an H.I. volunteer, said in a statement.

From Washington Times ● May 22, 2018

But when he followed up, in 1987, with two of his most memorable characters in two of his best films -- as the rooster-haired babynapper H.I.

From Salon ● Apr. 18, 2011

H.I. himself took heaps of tickets, but the house was half empty.

From The Story of My Life Recollections and Reflections by Ellen Terry

Related Words

• hello
• nod
• ovation
• reception
• salute