What word should be used only when expeditious compliance is needed to avoid an imminent situation?

The term "immediately" is specifically used in contexts where immediate action is necessary to prevent or respond to an imminent situation. This word conveys a sense of urgency that indicates no delay is acceptable, and it is crucial that the required action be taken without any hesitation.

In operational contexts, using "immediately" establishes a clear expectation for rapid response, ensuring that all relevant parties understand the critical nature of the task at hand. It signifies that the situation requires swift attention to avert potential risks or dangers.

In contrast, the other terms may suggest urgency but do not necessarily convey the same level of immediacy. For instance, "quickly," "urgently," and "promptly" all imply a need for speed but can allow for a slight degree of flexibility in timing, which may not be appropriate in situations where immediate action is essential.