"That degree of air superiority where opposing forces can't effectively interfere with air assets" is known as?

The definition presented in the question refers specifically to air supremacy, which is characterized by a situation where one side has complete control of the airspace. In this state, opposing forces lack the capability to effectively challenge or disrupt the operations of air assets.

Air supremacy implies that friendly forces can conduct aerial operations without significant risk of interference from the enemy, thus allowing for sustained operations and support for ground and naval forces. This level of control is essential for successful military operations, as it maximizes the effectiveness of air assets while minimizing the risks posed by enemy air defenses and capabilities.

In contrast, air superiority, while also referring to having an advantage in the air, does not necessitate the complete elimination of enemy threats; it instead allows for a relative advantage where operations can be conducted with some level of risk from adversary forces. The other terms, such as "control of the air" and "favorable air situation," relate to variations of air dominance but do not capture the totality implied by air supremacy.