The term 'appertain' is a verb that means to be relevant or connected to something. It can be broken down into six crossword solutions: RELATE, CONCERN, REFER, APPLY, PERTAIN, and BELONG. RELATE means to have a connection with something, CONCERN means to be of importance to something, REFER means to direct attention to something, APPLY means to make use of something, PERTAIN means to be related to something, and BELONG means to be part of something. All of these words are related to the term 'appertain' in that they all describe having a connection or relevance to something.