adj.
1.absolutely necessary
2.basic and fundamental
3.of the greatest importance
4.being or relating to or containing the essence of a plant etc
5.applying to essential legal principles and rules of right
6.absolutely required and not to be used up or sacrificed essential n.
1.anything indispensable
Idiom of the Day
win over (someone) or win (someone) over
to gain the support and sympathy of someone
We finally won the apartment manager over and she will let us have a pet in our apartment.