JAK Views 7 meanings found JAK most frequently refers to Janus‑activated kinases, a family of enzymes important in cell signaling, and it also names a Java API for KML as well as informal references to other kinases. Medical Just Another Kinase Janus Activated Kinase Miscellaneous Joey Aussie Kangaroo Jayne Ann Krentz Regional Jazakom Allah Khairan Computing Java API for KML Business Jord Arbete Kapital