The term 'pertain' is a verb meaning to have relevance or connection to something. The crossword solutions for this term are 'APPERTAIN' (9 letters), 'CONCERN' (7 letters), 'AFFECT' (6 letters), 'REFER' (5 letters), 'APPLY' (5 letters), 'BELONG' (6 letters), and 'RELATE' (6 letters). All of these words can be used to describe the idea of having relevance or connection to something, with 'APPERTAIN' being the most direct synonym. 'CONCERN' implies that something is related to a particular matter, while 'AFFECT' suggests that something has an influence on something else. 'REFER' and 'APPLY' both suggest that something is connected to a certain topic, while 'BELONG' and 'RELATE' imply that something is part of a larger group or idea.