EDIT STARTS:That's not what it meant. In pre-WW1 discussion, the all-same-size battery distinction is only meaningful in relation to the pervious classes of battleship. Dreadnoughts were optimized for the main battery to be used at its longest range, rather than the mixed batteries of previous battleships that would be employed at intermediate ranges.
I've just realised I totally misinterpreted this portion of your post, and that you and I are saying basically the same thing.
I'm leaving my original comments for transparency, but I do apologise for misreading your post, and for the confrontational nature of the response. I leapt to "somebody is wrong on the Internet!" and I'm sorry for that.
I do stand by the broader conclusion that by 1920, almost every warship met the definition of a "dreadnought" and that today, the term is meaningless and sci-fi writers are annoying when they use it to mean "battleship."
EDIT ENDS.
Ummm. No.
A Dreadnaught-type Battleship or Cruiser had:
-A main battery that was all the same size and caliber of gun, so that spotters could accurately determine which shells came from which guns. This made it easier for long range shooting to be accurate. It also made intermediate range shooting more accurate. Basically, a Dreadnaught's main battery was simpler and more accurate but had fewer guns.
-Steam turbine engines. This is the part that people forget. Dreadnaughts had super-advanced engines (for 1905) which meant they could control the range in a fight with pre-Dreadnoughts.
"Dreadnought cruisers" meant battlecruisers. There were some at the time who thought that the Invincible type could replace the slower, more heavily armored battleship. By WW1, dreadnought is pretty much synonymous with battleship.
I mean, all of this is correct, and is what the Admiralty meant when they said "Dreadnought type cruisers," but isn't how the term was used in Parliament (both the UK and Canadian) or newspapers in 1910. There's nothing in the definition of "dreadnought" that confines it to capital ships.
Also, few in 1910 thought an Invincible was going to replace a battleship; a battlecruiser's job is to kill cruisers, not fight battleships, and most people recognised that they lacked the staying power to fight BBs - or even other BCs.
No, nobody at the time [WW2] would use the term that way.
And I didn't say anyone did. By 1920 the term has vanished form real-world use. This doesn't change the fact that all the major surface combatant ships from destroyers on up of WW2 had main batteries with a single gun type and steam turbine engines, which means they fit the definition of "dreadnought." My point was that by about 1920, "Dreadnought" was a meaningless word because all warships were dreadnoughts, and the general public had abandoned it. So it bugs me that Sci-Fi keeps reinventing it instead just using terms that describe a ship's actual function.
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