hi

interjection

(used as an exclamation of greeting); hello!

Relevant Questions

Origin:
1425–75; late Middle English hy, perhaps variant of hei hey

Dictionary.com Unabridged

adjective

an informal, simplified spelling of high: hi fidelity.

00:10

Hi is always a great word to know.

So is quincunx. Does it mean:

an extraordinary or unusual thing, person, or event; an exceptional example or instance.

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

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Hawaii (approved especially for use with zip code).

Hawaiian Islands.

Meteorology. heat index.

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To hi

Collins

World English Dictionary

hi¹ (haɪ)

—*sentence substitute*
	an informal word for hello

[C20: originally US, from hiya]

hi² (haɪ)

—*interj*
	an expression used to attract attention

[C15 hy; compare hey]

HI

—*abbreviation for*
1.	Hawaii (state)
2.	Hawaiian Islands

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

greeting, 1862, Amer.Eng. (first recorded reference is to speech of a Kansas Indian), originally to attract attention, probably a variant of M.E. hy, hey (late 15c.) also an exclamation to call attention. Extended form hiya attested from 1940.

Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary