"3. (with reference to motion, light, sound, etc.) transmit or be transmitted in a particular direction or through a medium" This is the third definition the

"3. (with reference to motion, light, sound, etc.) transmit or be transmitted in a particular direction or through a medium" This is the third definition the search engine I use returns for the term, and by it you are indeed correct. The direction, and method are unspecified. In other words, the term "propagation" is quite likely not the source of people's confusion that the original blog post thinks it is. It's great that they investigated for themselves and figured out what's going on, and wrote up an explanation of it. That's useful, but note the section of the post 'okay, DNS records actually do “propagate”.'. By taking issue with the term "propagate" they've just muddied the waters yet again.