B1
very important and necessary
Dictionary examples:
A good imagination is essential when explaining why you're late to work. (0.0)
Coffee is essential for my brain to start working in the morning. (0.0)
Knowing how to run is essential when you're late for the bus. (0.0)
Water is essential for/to living things. (28.5)
Government support will be essential if the project is to succeed. (37.7)
It is essential that our prices remain competitive. (42.0)
Computers are an essential part of our lives. (62.7)
For the experiment to be valid, it is essential to record the data accurately. (65.1)