This is the 2885th most frequent German word.
wesentlich
Essential; fundamental; significant.
In this context, 'wesentlich' means 'essential' or 'indispensable' to emphasize the importance of an element in the plan.
Das ist ein wesentlicher Teil unseres Plans.
This is an essential part of our plan.
Here, 'wesentlich' is used to describe a substantial or significant level of difference between the two items.
Der Unterschied zwischen den beiden ist wesentlich.
The difference between the two is significant.
In this example, 'wesentlich' communicates the critical necessity of an action to ensure success or efficiency.