1. To retain possession of. 2. To have a supply. 3. To cause to continue in a state, condition, or course of action. 4. To adhere or conform to; follow. 5. To be faithful to; fulfill: keep one’s word. 6. To celebrate; observe. 7. To maintain records or entries, enter data, detain, restrain, prevent, deter, refrain from indulging, save; reserve.