Definition of "h"

h¹

/eɪt͡ʃ/

letter
lower case, upper case H, plural hs or h's
1. The eighth letter of the English alphabet, called aitch and written in the Latin script.
number
lower case, upper case H
1. The ordinal number eighth, derived from this letter of the English alphabet, called aitch and written in the Latin script.

h²

noun
1. (sciences) Abbreviation of hour (particularly when used as a (non-SI) unit of time alongside International System of Units (SI) units)
  Quotations
  Another instance: 2h28m p. m., 10 micra; 3h08m p. m., 0 micra; irrigated with water: 3h09m p. m., 4 micra.
  1908, Francis Ernest Lloyd, The Physiology of Stomata, Carnegie Institution of Washington, page 83
2. (baseball, in statistics) Abbreviation of hit, the number of hits by a player
3. (slang) Abbreviation of heroin.
4. (computing) Abbreviation of hexadecimal (following a number)
  Quotations
  If any of the video buffer's background attribute bits are on, MONO converts the attribute to 70h (inverse video).
  1989, PC: The Independent Guide to IBM Personal Computers
  The commands assume that the NV memory is addressed beginning at 8000h in external data memory.
  1994, Jan Axelson, The microcontroller idea book, page 47
5. Abbreviation of home phone.
verb
1. (stenoscript) Abbreviation of have and inflections having, had

h³

adjective
comparative more h, superlative most h
1. Alternative form of H