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hi

1 American  
[hahy] / haɪ /

interjection

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


hi 2 American  
[hahy] / haɪ /

adjective

  1. an informal, simplified spelling of high.

    hi fidelity.


HI 3 American  

abbreviation

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

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


H.I. 4 American  

abbreviation

  1. Hawaiian Islands.

  2. Meteorology. heat index. Also HI


HI 1 British  

abbreviation

  1. Hawaii (state)

  2. Hawaiian Islands

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

hi 2 British  
/ haɪ /
  1. an informal word for hello

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

hi 3 British  
/ haɪ /

interjection

  1. an expression used to attract attention

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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.

Keep Reading on Vocabulary.com

Vocabulary lists containing hi

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

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

From The Wall Street Journal Jul. 14, 2026

Just walking down the street in Boston wearing any type of Scotland merchandise will result in people waving, saying hi or shouting "good luck Scotland".

From BBC Jun. 19, 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

“You bet! Well, I’ll let you all enjoy your pizza. Just wanted to say hi to the birthday girl. I’ll see you Thursday, Grace.”

From "Keeping Pace" by Laurie Morrison

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

However, at the HI San Francisco Fisherman’s Wharf Hostel, you can find a bed in a shared room for less than $30 or a private room for less than $100 on some nights.

From Seattle Times Nov. 29, 2023

"We expect the inflation to fall below 3% in the third quarter and the Bank of Korea to consider cutting rates soon thereafter," said Kim Myoung-sil, fixed-income analyst at HI Investment & Securities.

From Reuters May 2, 2023

He was a "scholarly, lonesome, handsome man of few words, who remained a bachelor," wrote the Indian bacteriologist HI Jhala.

From BBC Dec. 10, 2020

The cheering men danced and marched down Broadway, HI tossing their hats into the air and shouting across the river at the silent ships of England.

From "Chains" by Laurie Halse Anderson

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

From Seattle Times May 26, 2022

“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

If Ray is the hapless Jerry Lundegaard type — or the H.I.

From New York Times May 17, 2017

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

The child of either sex in New England is both taller and heavier than the English child of corresponding class and age, as Dr. H.I.

From Fat and Blood An Essay on the Treatment of Certain Forms of Neurasthenia and Hysteria by Mitchell, John K.

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