This article defines the terms "acronym" and "initialism" and gives examples of each.
Initialism: An abbreviation consisting of the first letter or letters of words in a phrase (for example, IRS for Internal Revenue Service), syllables or components of a word (TNT for trinitrotoluene), or a combination of words and syllables (ESP for extrasensory perception) and pronounced by spelling out the letters one by one rather than as a solid word.
You may know the definition that says that an acronym is a word formed from the initial letters of other words; for example, NASA and RAM. There is some debate, though, whether words like USA and HTML should also be called acronyms. The issue is whether or not you feel that acronyms must be pronounceable as a word.
One camp in this debate argues that words like USA and HTML are acronyms. The other camp argues that they're not because they aren't pronounced as a word but are sounded out one letter at a time. That is, yoo-ess-ay and aitch-tee-em-ell.
This leads us to two different definitions of acronym:
An acronym is a word that is formed from the initial letters of other words; for example, NASA and HTML.
An acronym is a word that is formed from the initial letters of other words and is pronounced as a word, not spelled out one letter at a time; e.g. NASA.
Here are some examples that everyone should agree are acronyms:
- ASCII: American standard code for information interchange
- NASA: National Aeronautics and Space Administration
- Qantas: Queensland and Northern Territory Aerial Services
- RAM: random-access memory
- ROM: read-only memory
- HTML: hypertext markup language
- IBM: International Business Machines
- USA: United States of America
- WA: Western Australia
One term that fits the bill nicely is initialism. The American Heritage Dictionary provides the following definition of this term:
Initialism: An abbreviation consisting of the first letter or letters of words in a phrase (for example, IRS for Internal Revenue Service), syllables or components of a word (TNT for trinitrotoluene), or a combination of words and syllables (ESP for extrasensory perception) and pronounced by spelling out the letters one by one rather than as a solid word.
Distinguishing between acronyms and initialisms in this way is by no means universal. If you like new words, though, this seems like a good one.
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