prevention; preventive measure
Refers to stopping problems before they occur; often used in business, safety, and quality control contexts.
We strive to prevent accidents before they happen.
In quality control, prevention is important.
予防 is more common for health and disease prevention, while 未然防止 is broader and often used in formal or technical contexts for preventing any undesirable event.
Compound of 未然 (みぜん, 'before it happens') and 防止 (ぼうし, 'prevention').