The phrase "matter knowledge" refers to having knowledge or understanding about a particular subject or topic. It means being familiar with and having expertise in a specific area or field of study. Full definition
Teachers may be able to ascertain the depth of a candidate's subject matter knowledge in a way an administrator can't. (ascd.org)
She had such a positive attitude and the ability to run a room of various fitness levels while keeping everyone's interest no matter their knowledge of Yoga. (dianazic.com)
We integrate deep subject - matter knowledge with the expertise required to realize your ambitions. (collaborativecommunications.com)