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Synonyms

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:

“That was fun. Say hi to Snow White,” Staley wrote in a July 2010 email.

From The Wall Street Journal ● Aug. 27, 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

“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

If you ever feel like grabbing a coffee or saying hi, I’d love that.

From Salon ● Jan. 27, 2026

“We were only saying hi, how are you,” I explain.

From "Clairboyance" by Kristiana Kahakauwila

AFP witnessed some pushing and shoving between front-row protesters and officers trying to keep the surging crowd away from Jakarta's central Bundaran HI public square, surrounded by businesses and embassies.

From Barron's ● Oct. 28, 2026

AFP saw pushing and shoving between front-row protesters and officers trying to keep the surging crowd away from Jakarta's central Bundaran HI public square, which is surrounded by businesses and embassies.

From Barron's ● Oct. 28, 2026

As the flow of gas from the cosmic web becomes weaker and gas densities decrease, galaxies may become less efficient at converting HI into molecular hydrogen.

From Science Daily ● Sep. 3, 2026

At HI NYC, the company’s top-booked hostel, occupancy has surpassed 2019 levels.

From Seattle Times ● Nov. 29, 2023

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

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

From New York Times ● May 17, 2017

It sponsors many of the local monthly music events: First Fridays at the Oregon VFW, the Lanark jam the second week at Cherry Grove Church, Fridays at the H.I.

From Washington Times ● Jan. 5, 2016

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

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