The term which relates specifically to the amplitude levels of multiple signals that can be accommodated during reception is called:

Dynamic range in a receiver refers to its ability to handle strong signals and weak signals simultaneously without severe distortion or interference. It is a measure of the span of amplitude levels that the receiver's front end can effectively accommodate from the noise floor up to the point of overload. While distractors like Automatic Gain Control (AGC) are related to handling varying signal strengths, AGC is a circuit that adjusts the receiver's gain, not a measurement of amplitude capacity. The noise figure relates only to the internal noise of the receiver, which establishes the bottom end of the dynamic range but not the overall span. Cross-modulation index is a distractor related to distortion, which occurs when a receiver's dynamic range is exceeded. Therefore, dynamic range is the specific technical term for this amplitude accommodation capability.