\ 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

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 Britt Baker gave her comeuppance by using Lockjaw wit ha Steelers glove. Alfred Konuwa, Forbes, 21 Apr. 2022 Shu, ha and ri are considered stages that someone goes through to become a true master. John Knotts, Forbes, 12 Apr. 2022 Young-ha Kim's Black Flower tells the tale of these men and women who have, until now, been lost to history. Emily Burack, Town & Country, 9 Apr. 2022 Great memories with my little brother Donnie and my disapproving older brother Brian, ha! Justin Raystaff Writer, Los Angeles Times, 7 Apr. 2022 As season six of the Outlander show is currently airing on Starz, now's the perfect time (ha) to dive into time travel books. Emily Burack, Town & Country, 20 Mar. 2022 Ha ha, sorry everyone—that was an inside joke between me and . . . Eli Coyote Mandel, The New Yorker, 16 Mar. 2022 Though the veterans are the two likely front-runners for the role of QB1, Auburn ha a trio of inexperienced quarterbacks who could make thinks more interesting this offseason. Tom Green | Tgreen@al.com, al, 1 Mar. 2022 This simply makes Lego's hammer kit all the more worthy (ha) as a collector's item for MCU lovers, especially those who can't wait for Thor: Love and Thunder to land in theaters this summer. Nina Huang, EW.com, 10 Feb. 2022 See More

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.

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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Dictionary Entries Near ha




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Statistics for ha

Last Updated

6 May 2022

Cite this Entry

“Ha.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ha. Accessed 29 May. 2022.

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More Definitions for ha


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

More from Merriam-Webster on 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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