The term "working knowledge" refers to a level of understanding or familiarity with something that allows an individual to effectively perform tasks and complete projects related to it. It is often used in reference to technical skills, where having a working knowledge means being able to use specific tools or software to accomplish a job-related task. In other words, "working knowledge" implies the ability to apply one's understanding of something in practical situations, making it an essential component for success in many fields and industries.