1 of 3


variants or hah
used especially to express surprise, joy, or triumph


2 of 3

abbreviation (1)



3 of 3

abbreviation (2)

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.
hour angle

Examples of ha in a Sentence

Interjection ha! I was right all along!
Recent Examples on the Web
Su trabajo ha sido reconocido con premios de Florida Society of News Editors y Society for Profesional Journalists. Nora Gámez Torres, Miami Herald, 15 Feb. 2024 To that, Shohei Ohtani and the Dodgers are here to say ho, ho, ho to Dodgers fans and ha, ha, ha to the rest of the league. Bill Shaikin, Los Angeles Times, 9 Dec. 2023 Baruch atah Adonai Eloheinu melech ha'olam hamotzi lechem min ha-aretz. Jamie Kravitz, Woman's Day, 28 Aug. 2023 Like keep your ha, keep your government out of my family. Laura Johnston, cleveland, 19 July 2023 Jackson is a Texarkana, Texas, graduate who ha 23 tackles and 3 sacks as a 7-game starter last season. Tom Murphy, Arkansas Online, 11 July 2023 Spero che chi ha compiuto questo gesto venga individuato e sanzionato secondo le nostre leggi. Sarah Kuta, Smithsonian Magazine, 28 June 2023 The vessel ha dabout 96 hours of oxygen, and that oxygen is expected to run out on Thursday. Rick Sobey Boston Herald (tns), al, 21 June 2023 The White Plains, New York, native is hoping to jump (ha) into meeting his wife this season. Olivia Evans, Women's Health, 16 June 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'ha.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History



Middle English, from Old English

First Known Use


before the 12th century, in the meaning defined above

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

Dictionary Entries Near ha

Cite this Entry

“Ha.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ha. Accessed 20 Feb. 2024.

Kids Definition


variants or hah
used to express surprise, joy, or victory

Medical Definition


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

Last Updated: - Updated example sentences
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