Annihilate vs. Decimate: What's the Difference?
Quick Answer
"Annihilate" means to destroy completely, leaving nothing behind. "Decimate" originally meant to kill one in every ten but now commonly means to destroy a large portion of something. The core difference: annihilation is total destruction, while decimation is severe but not complete.
Annihilate: Total Destruction
"Annihilate" leaves no room for survival or recovery. When something is annihilated, it is wiped out entirely.
- The asteroid impact annihilated all life within a 500-mile radius.
- Their defense annihilated the opposing team's offense, holding them scoreless.
- The fire annihilated the building — nothing remained but the foundation.
- When matter meets antimatter, both are annihilated in a burst of energy.
- The debate performance annihilated her opponent's credibility on the issue.
In physics, "annihilation" has a specific technical meaning: the conversion of matter and antimatter into energy. In everyday use, it simply means complete destruction.
Decimate: Destroy a Large Part
"Decimate" carries an interesting history. In the Roman army, decimation was a punishment where one soldier in every ten was selected by lot and executed. The word literally comes from the Latin "decimare" (to take a tenth).
In modern English, "decimate" has shifted to mean causing severe destruction to a large portion of something, though not necessarily destroying it completely.
- The hurricane decimated the coastline, destroying hundreds of homes.
- Budget cuts decimated the department, reducing staff from forty to twelve.
- Disease decimated the colony's population during the first winter.
- Overfishing has decimated tuna stocks in the region.
- The recession decimated property values in several neighborhoods.
The Historical Debate
Some language purists insist "decimate" should only mean "reduce by one-tenth." In practice, virtually no one uses it this way anymore. Modern dictionaries list "to destroy a large proportion of" as the primary definition. Using "decimate" to mean severe (but not total) destruction is standard in contemporary English.
That said, using "decimate" to mean total destruction is a step too far for careful writers. If everything is destroyed, "annihilate" is the better word.
When to Use Which
Use "annihilate" for total, complete destruction:
- The army annihilated the enemy forces. (No survivors.)
Use "decimate" for severe but incomplete destruction:
- The plague decimated the population. (Many died, but some survived.)
Common Mistakes
The most frequent error is using "decimate" and "annihilate" interchangeably. If survivors remain, you're describing decimation. If nothing survives, that's annihilation.
Another mistake is writing "completely decimated." Since "decimate" implies partial (though severe) destruction, "completely decimated" is contradictory. Use "annihilated" instead.
Intensity Scale
If you need a word for partial harm, you have several options along a spectrum:
- Damage: general harm, any severity
- Decimate: severe destruction of a significant portion
- Devastate: cause overwhelming destruction or grief
- Annihilate: destroy entirely, nothing left
Choosing the right word depends on how much is left standing after the destruction.
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