There's a argument called "Debate" in which there is a discussion category entitled "Topicality." Now the purpose of topicality is to make sure that the affirmative team that is "upholding" the resolution remains within the topic of the resolution, therefore if a resolution is "Resolved: that the United States Federal Government should substantially increase subsidies for renewable energy" the affirmative team can not talk about mental health care, and thus the negative team has a reasonable chance at researching things that are tangential to the affirmative case.
Within this argument of topicality, there is an argument called "contextual definition." The argument is that the team's definition of a word within the resolution is specifically referring to the topic and thus is a better definition because it comes from an expert source that actually deals with the specific subject matter. Referring to the previous examples, this would mean that a definition of "energy" in terms of renewable energies that comes from an expert on renewable energy is better than a common dictionary definition of "energy" that might refer to having people drink a lot of 5 hour energy drinks, would be be far outside the context of the resolution.
So furthering this point, your (Jammer Six) definitions are taken WAY out of context. When talking specifically about tank theorycrafting, WarTotems definitions are the commonly accepted definitions in the realm of warrior theorycraft. In another context, they might not mean the same thing, just as your definitions (by the way I really like how many you had to dig up to find one that suited your needs).
In the realm of what actually happens in game, "avoidance" is not guaranteed. Yes when you do dodge an attack it was an act and you did avoid it, but you're by no means guaranteed that chance to avoid. Block is the same way, except you're not completely avoiding the damage, you have a static chance as per your paper doll to block any given attack, it is not a guarantee, and when you do block said attack, you still take damage, just that damage is mitigated. Therefore block is a "chance to mitigate" damage.
Again, within the context of warrior theorycraft, WarTotem's definitions are the correct ones and the ones most commonly used amongst all tank theorycrafters. It is pretty much agreed on. Glad we could straighten that out for you =D
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