I often see questions such as this one that are downvoted because:
Questions on the definitions or semantics of words or phrases are off-topic here as they are already well-answered elsewhere. There are many fine dictionaries available on The Internet, and Wikipedia offers good introductions to most common schools of philosophy.
I have in the past seen questions that could be answered simply by referring to a dictionary. To me, however, it seems:
Sometimes people are looking for technical definitions that would differ from the common-usage definition. These seem like they should be on-topic since one cannot easily find something in the dictionary that addresses the question.
Sometimes, as in the above linked question, "There is no online resource which explains the term and what is this position." I can see sometimes closing questions because the answer is to read the IEP or Stanford or Wikipedia article, but if there is none it seems odd to close the question in that case.
In any case, these non-dictionary-definitions seem to be great fits for the SE format - they are objective (whatever one thinks about the usefulness of a given definition, whether a definition is the right one is objective) and there are often subtleties that having a community to help one understand is helpful.
What does the community think about this? Do we need to be more specific about the "definition" close reason? Have others been using similar reasoning for when to close due to the question being a "definition" question?