1

ha

interjection \ ˈhä \
variants: or
Updated on: 15 Nov 2017

Definition of ha

used especially to express surprise, joy, or triumph

Examples of ha in a Sentence

  1. ha! I was right all along!

Recent Examples of ha from the Web

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.

Origin and Etymology of ha

Middle English, from Old English

ha Synonyms

Synonyms
glory (or glory be), hooray (or hah), hallelujah, hey, hot dog, huzzah, wahoo [chiefly West], whee, whoopee, yahoo, yippee
Related Words
wow, zowie; ooh; gee, gee whiz, gosh
Near Antonyms
alack, alas, aw, boo

2

ha

abbreviation

Definition of ha

hectare

HA

abbreviation

Definition of HA

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

HA Defined for English Language Learners

ha

interjection

Definition of ha for English Language Learners

  • —used especially to express surprise or a feeling of pleasure that you have when you do something or find out about something


HA Defined for Kids

ha

interjection
variants: or hah \ˈhä\

Definition of ha for Students

used to show surprise or joy

Medical Dictionary

HA

abbreviation

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. RussellThe New England Journal of Medicine20 Oct. 2011


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