The phrase "is a matter of" implies that there is a particular issue or concern that needs to be addressed. Synonyms for this phrase include "concerns," "relates to," "pertains to," "involves," "revolves around," and "centers on." Other similar phrases include "is all about," "deals with," "focuses on," and "touches on." These phrases are often used to indicate the main point or topic of discussion in a conversation, essay or presentation. Whether you are a student writing a paper or a business professional giving a presentation, using these synonyms can help you communicate your ideas more effectively.