One of the close reasons for off-topic questions is the following:
Basic questions on spelling, meaning or pronunciation are off-topic as they should be answered using a dictionary. See: Policy for questions that are entirely answerable with a dictionary.
I take it that questions like the following ones would be closed, as the answer would be provided by a dictionary.
What does sun mean?
What is the difference between dawn and sunset?
I take it the closing reason is saying that questions about the meaning of a word/phrase for which a context is not given should not be asked, as the answers would end up listing all the meanings of a word/phrase, which is exactly what a dictionary does.
I understand that meaning-in-context means the question is about the meaning of a word/phrase in the specific context, but the context should always be required; otherwise, the question would be closed for the reason I quoted at the beginning of this question. If users find a question that is tagged (among other tags) meaning, they are not surely induced to think that the word/phrase always has the meaning reported in the answers, and only those meanings; if I read that moon means "expose one's buttocks to someone in order to insult or amuse them," I will not surely think I cannot say the moon because otherwise people could think I am talking of the act of exposing my buttocks.
Also, since the questions on ELL are being asked from users who could not know all the meanings a word/phrase has, they cannot evidently know if the meaning of a word/phrase is specific for that context, or it is the general meaning.