\ ˈhä How to pronounce ha (audio) \
variants: or

Definition of ha

 (Entry 1 of 3)

used especially to express surprise, joy, or triumph

Definition of ha (Entry 2 of 3)


Definition of HA (Entry 3 of 3)

1 hemagglutinin Different circulating influenza A viruses are identified by referring to two signature proteins on their surfaces. One is hemagglutinin (HA), which has at least 15 known variants, or subtypes.— Jeffery K. Taubenberger et al.
2 hour angle

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Synonyms for ha

Synonyms: Interjection

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Examples of ha in a Sentence

Interjection ha! I was right all along!
Recent Examples on the Web: Interjection And while some were quick to joke that the Swiss cheese-like fashion mirrored our mental state after a year in the pandemic (hanging by the thread — ha. Irina Grechko, refinery29.com, "The Curious Case Of Fashion’s Obsession With Cut-Outs," 24 Mar. 2021 And while some were quick to joke that the Swiss cheese-like fashion mirrored our mental state after a year in the pandemic (hanging by the thread — ha. Irina Grechko, refinery29.com, "The Curious Case Of Fashion’s Obsession With Cut-Outs," 23 Mar. 2021 Una hechicera hipnotiza a un joven para liberar de la muerte a Pancho y Marisela, quien se entera de que se ha enamorado. Los Angeles Times, "Movies on TV this week: ‘Lust for Life’; ‘Platoon’ and more," 5 Mar. 2021 Estamos pidiéndoles a las familias o a los amigos que nos ayuden a identificar a cada Utahn que ha muerto de la coronavirus. The Salt Lake Tribune, "Help The Tribune tell the stories of Utahns who have died from COVID-19," 4 Dec. 2020 De Laura went 18 of 33 for 227 yards with two touchdowns and an interception and ha eight carries for 43 yards and a score to lead Washington State to a 38-28 upset at Oregon State last week. oregonlive, "Oregon Ducks not viewing Washington State QB Jayden de Laura as a freshman: ‘He can hurt you in every way’," 12 Nov. 2020 Ha ha, no, not at all—although my red running shoes may have been guilty of a fashion crime. Laird Borrelli-persson, Vogue, "Corey ‘Sunglasses at Night’ Hart on Balenciaga, Orwell, and the 1980s," 28 Oct. 2020 At the end of a long, cold Texas winter (ha), is there anything better than seeing the bluebonnets start to poke out of the ground? Abigail Rosenthal, Chron, "Opinion: Texas is actually very good, no matter what the haters say," 27 Oct. 2020 Ha, ha, his hand goes down pantsings for two seconds! Kyle Smith, National Review, "Borat Make No Funny in MovieFilm Second," 22 Oct. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ha.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of ha


before the 12th century, in the meaning defined above

History and Etymology for ha


Middle English, from Old English

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Time Traveler for ha

Time Traveler

The first known use of ha was before the 12th century

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Last Updated

12 Apr 2021

Cite this Entry

“Ha.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ha. Accessed 21 Apr. 2021.

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More Definitions for ha

English Language Learners Definition of ha

used especially to express surprise or a feeling of pleasure that you have when you do something or find out about something
variants: or hah \ ˈhä \

Kids Definition of ha

used to show surprise or joy

Medical Definition of HA

hemagglutinin Seasonal strains … evade our immune systems after vaccination or previous infection by constantly changing the structure of their hemagglutinin (HA) surface protein.— Charles J. Russell, The New England Journal of Medicine, 20 Oct. 2011

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More from Merriam-Webster on ha

Thesaurus: All synonyms and antonyms for ha

Nglish: Translation of ha for Spanish Speakers

Britannica English: Translation of ha for Arabic Speakers

Britannica.com: Encyclopedia article about ha

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