Merriam-Websters’ definition can be found here. I frequently use this word as it carries the academic connotation of akin to fight. When I’m talking in person, I usually pause a beat before deciding discussion is the most effective word.
In the GamerGate project, I see the hashtag as more of a record of a fight. But fight doesn’t carry the same academic weight as discussion. Argument is also a probable synonym, but that holds a different meaning in academia. Attack would also probably work, if it did not also carry military and conquest elements. And while these additional elements may meaningfully add to the conversation, I am making the call that it opens the conversation to be directed in unintended ways I wish to avoid.