World English Dictionary
hi1 (haɪ)
sentence substitute
an informal word for hello
[C20: originally US, from hiya]

hi2 (haɪ)
an expression used to attract attention
[C15 hy; compare hey]

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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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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American Heritage
Abbreviations & Acronyms
  1. high

  2. Hindi

  1. Hawaii

  2. high intensity

  3. humidity index

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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