Earlier quoted context omitted.
While that is the origin of the word, to pretend it still only means that is pretty delusional. Words change meaning based on usage.
sure, I'm being pedantic. But, if it's called out as "the perfect word" I assume the OP would want to know (just like I welcomed the correction when I first learned it).
> to destroy a great number or proportion of: The population was decimated by a plague.
If the acceptance criteria of for use as 'the perfect word' is that it matches as precisely as possible to its definition then I think the OP was on track.
I think it is interesting trivia that the origins of the word come from the violence of the Roman army, but to assert that is the only way the word is used in modern English is wrong. I blame Dan Carlin's Hardcore History podcast for the recent surge in smug people 'correcting' the use of this word.