What was the weight of the battleship in World War 1?

There was no standard size, or cutoff point so far as weight goes. The most recent US battleships built in the years just before the war displaced about 27,000 tons. Ship size is given in "displacement", or the weight of the water the ship would "displace" if it could somehow be placed into a completely full tub of water, and the amount of water overflowing out after the ship was put in could be caught and weighed. This is not necessarily the same weight as the amount of steel which went into building the ship. Displacement is often given as "standard", and "loaded", the latter figure including fuel and ammunition on board. This increased the displacement of US WWI "dreadnought" modern battleships to over 28,000 tons. Generally the definition of a battleship is one possessing sufficient armor to protect itself against being penetrated by shells fired from the same size guns which it mounts.