What is defined as anything that hinders visibility from enemy observation?

The term that refers to anything that hinders visibility from enemy observation is concealment. Concealment involves using terrain, vegetation, or other materials to hide oneself or one’s equipment from the enemy's view. Its primary function is to prevent detection, thereby allowing forces to move, position themselves, or conduct operations without being seen.

Understanding concealment is crucial in military operations, as it directly impacts the element of surprise and the effectiveness of tactics. When a unit successfully uses concealment, it can position itself advantageously without alerting the enemy to its presence. This is especially important in combat scenarios, where the ability to hide can protect personnel and resources.

While camouflage is related and often used in conjunction with concealment, it specifically refers to the techniques and materials used to blend in with the environment, rather than the general concept of obscuring visibility. Cover, on the other hand, refers to physical structures that provide protection from enemy fire, rather than solely hindering visibility. Obfuscation involves making something unclear or unintelligible, which does not properly relate to the concept of hindering visibility.