ha

1 of 3

interjection

ˈhä 

variants or hah

—used especially to express surprise, joy, or triumph

ha

2 of 3

abbreviation (1)

hectare

HA

3 of 3

abbreviation (2)

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

Interjection

• glory
• glory be
• hallelujah
• hey
• hooray
• hurrah
• hurray
• hot dog
• huzzah
• wahoo [chiefly West]
• whee
• whoopee
• yahoo
• yippee

Examples of ha in a Sentence

Interjection

ha! I was right all along!

Recent Examples on the Web

Interjection

Read in English Post Buy Copies El rápido avance de la IA ha despertado el entusiasmo por su potencial para revolucionar la toma de decisiones corporativas al sustituir a humanos caros y falibles. —Martin Reeves, Harvard Business Review, 11 Dec. 2024

Built on the endearingly boyish charm of lead Grant Gustin, the longest-running (ha) of the Arrowverse shows would eventually overstay its welcome after nine seasons, its initial spark sapped by sister series. —Joshua Rivera, Vulture, 13 Nov. 2024

Hamas ha empezado a dar medicamentos a rehenes israelies Maine wants to lead in offshore wind. —San Diego Union-Tribune, 25 Nov. 2024

The collection's insurance policy calls for it, ha! —Mark Holgate, Vogue, 25 Oct. 2024

Word History

Etymology

Interjection

Middle English, from Old English

First Known Use

Interjection

before the 12th century, in the meaning defined above

Phrases Containing ha

• ha ha
• hoo-ha

Kids Definition

ha

interjection

variants or hah

ˈhä

—used to express surprise, joy, or victory

Medical Definition

HA

abbreviation

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