Not to be argumentative, shuyung, but I think you're jumping down throats here unnecessarily. A definition that requires you be one of a few thousand people on the planet to know whether it's satisfied or not is.. well, it's not very useful, IMO. It seems to me that you and your peers have narrowed the definition as shorthand for the subset of DDoS attacks you guys most concern yourselves with, and that's fine -- but I don't think it's fair to say that narrows the definition universally, nor should it necessarily.
To point out that the people disagreeing with you aren't just a few crackpot hobbyists, amateurs, or low-ranking professionals who are confused, I just went and found a few sites and organizations who have published articles including working definitions of distributed denial of service attacks. I'm sure you've heard of these organizations, and I think they rank at least some consideration, even from you.
Bold mine in the following:
What is a distributed denial-of-service (DDoS) attack?
In a distributed denial-of-service (DDoS) attack, an attacker may use your computer to attack another computer. By taking advantage of security vulnerabilities or weaknesses, an attacker could take control of your computer. He or she could then force your computer to send huge amounts of data to a website or send spam to particular email addresses. The attack is "distributed" because the attacker is using multiple computers, including yours, to launch the denial-of-service attack.
When this attempt derives from a single host of the network, it constitutes a DoS attack. On the other hand, it is also possible that a lot of malicious hosts coordinate to flood the victim with an abundance of attack packets, so that the attack takes place simultaneously from multiple points. This type of attack is called a Distributed DoS, or DDoS attack.
It's not very useful outside the group, that's true. That's also the case with all jargon. Legally, are you able to explain de minimis non curat lex?
As to your quotes, you realize you're attempting to use them out of context and both are concerned entirely with zombie hosts?