Medium tanks are simply neither the heaviest nor lightest in weight, and many of the designs had successful balance of firepower, mobility, protection, and endurance, and could often be adapted to a variety of roles. In WWI, the very first Mark I tank turned out to be a medium tank when compared to the range of designs of the time.
There were medium tanks that focused on anti-infantry capabilities (such as in WWII: the Panzer IV short-barrel, and the 75mm-turret M4 Sherman), and medium tanks which were more focused on the anti-tank role, mounting high-velocity tank guns.
In OMG the term Medium Tank can refer too:
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