First, since this is meta, I am keeping the question somewhat broad about the topics in question to be more applicable, while trying to keep the scope fairly narrow for the essence of the specific question.
I know that Stack Exchange specifically allows attribution to posts being considered as an allowed source, along with a process for creating the needed citations.
The scenario:
I was looking at a general Wikipedia page for a topic that falls within one Stack Exchange site's areas of knowledge. At the time there was an acronym that had a {citation required} tag and no in document reference to the meaning. In this particular case, I was able to come up with a likely candidate phrase for the term and was able to locate a verifiable resource that way.
My question is...
If I had not been able to locate a term, would it have been appropriate to ask on the related Stack Exchange site for meaning of the term and then make an update with that information to the general wiki?
It would be in effect me getting reputation for editing the standard wiki. However, it is information that I would be learning, I would be clear in asking the question for a true source that I was intending to use the result to clarify the general knowledge.
While Stack Exchange may consider itself to be a true source, its users as a great mass are not always what I would treat as a source of verification of an encyclopedia entry.