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Altering or adding to a prior word or term term that must be further defined in the light of later developments or technical innovation.

Example: No one called "World War One" that until there was a "World War Two" with which to contrast it. The going term during the 1914-1918 war and up to 1939 was "The Great War."
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Other employment of term retronym:

Telephone becomes "rotary-dial phone" to distinguish it from the push-button phones that became widespread in the 1970s and early 1980s (although rotary-dial phones still work if all you want to do is place a call and don't need to access features like querying a bank account balance).

Similarly, telephone also becomes "corded phone" to distinguish the traditional hard-wired telephone from those that are wireless in some way, such as cordless phones.

"Regular" coffee to distinguish it from decaffeinated coffee; some people say "caffeinated" coffee but strictly speaking this is a grammatical back-formation, not a retronym, because "to caffeinate" would mean to ADD caffeine to traditional coffee.

Note, though, that Coca-Cola is a "caffeinated" or "caffeine-containing" soft drink in its usual red-can form. Now that there is a Caffeine-Free Coca-Cola "caffeinated" could find use as a retronym for "the real thing."

"Manual" or "standard" or "stick" transmission on a car, none of which terms was necessary before automatic transmissions on cars became widespread and assumed to be the norm.

And, of course, "acoustic" guitar.
by al-in-chgo March 06, 2010
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May 2 Word of the Day
when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life
Dan: bro why have you been staring into space for the last hour doing nothing?
Me: bro i have a chronic cringe from what happened earlier I can't concentrate
by finesseeeee March 01, 2019
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Describes a word re-created to differentiate the original from newer incarnations of the same. Often preceded by "Analog", "Acoustic" or "Conventional".
snail mail, analog watch, rotary-dial telephone, or in America, "Ice Hockey".
by Robert Martin December 01, 2003
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