ha

¹

or hah

[ hah ]

interjection

1. (used as an exclamation of surprise, interrogation, suspicion, triumph, etc.)

ha

²

abbreviation for

1. hectare; hectares.

ḥā

³

[ khah ]

noun

1. the sixth letter of the Arabic alphabet, representing a pharyngeal spirant consonant.

hā

⁴

[ hah ]

noun

1. the 26th letter of the Arabic alphabet, representing a glottal spirant consonant sound.

Ha

⁵

Symbol, Chemistry, Physics.

1. hahnium.

h.a.

⁶

abbreviation for

1. Gunnery. high angle.
2. in this year.

ha

¹

/ hɑː /

interjection

1. an exclamation expressing derision, triumph, surprise, etc, according to the intonation of the speaker
2. reiterated a representation of the sound of laughter

Ha

²

abbreviation for

1. Hawaii

ha

³

symbol for

1. hectare

h.a.

⁴

abbreviation for

1. hoc anno

Word History and Origins

Origin of ha¹

Middle English word dating back to 1250–1300; ha-ha ¹

Origin of ha²

From Arabic

Origin of ha³

From Arabic

Origin of ha⁴

h.a. ( def 2 ) < Latin hōc annō

Word History and Origins

Origin of ha¹

Latin: in this year

Example Sentences

In the research that has been published on these procedures, several studies show the risks are relatively low for injecting HA, which can be dissolved.

From Salon

So far, he said, the virus has changed only minimally, especially the part of the virus that binds to human cells, called hemagglutinin or HA.

From New York Times

There are many possible combinations of HA and NA proteins.

From Los Angeles Times

All I had to do was reach up, pull it down, and—HA!—I was free!

From Literature

Scottish Borders HA said it has not been contacted by Thompsons but said it takes "several steps to prevent, diagnose and resolve damp and mould in tenants' homes".

From BBC