relating to the most important characteristics or ideas of something
It's essentially a dictionary but it differs in one or two respects.
What he's saying is essentially true.
The training program focused essentially on developing key skills necessary for effective leadership.
In literature, the essence of the novel lies essentially in its exploration of human nature and societal dynamics.
The core of the scientific theory can be summarized essentially in a few fundamental principles.
The team meeting dealt essentially with the critical aspects of the project, ensuring that everyone was aligned on the key objectives.