Definition from macmillandictionary.com
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In a large organization, good internal communication is essential.
Light is absolutely essential for the healthy development of plants.
He had acquired the skills essential to his later success in politics.
It is essential that all equipment is properly maintained.
If you want to make major changes, it is essential to involve your staff.
Her articles are essential reading for anyone interested in the war.
She has always played an essential part in the smooth running of the business.
the essential characteristics of Marxist political thought
The essential difference between us is that I take life seriously.
essential services such as shops and buses
food, fuel, and other essential supplies