essential

adjective
B1
OPAL
OPAL
1
B1
completely necessary; extremely important in a particular situation or for a particular activity
ضروری, لازم, اساسی, حیاتی
opposite dispensable
2
B2
connected with the most important aspect or basic nature of somebody/something
ضروری, اساسی, لازم, بنیادی, اصلی
The essential difference between Sara and me is in our attitude to money.
He describes what he thinks is the essential nature of America.
The essential character of the town has been destroyed by the new road.
The film captures an essential truth of adolescence
synonym fundamental
noun
1
something that is needed in a particular situation or in order to do a particular thing
ضروریات, ملزومات, لازمه, نیاز
2
an important basic fact or piece of knowledge about a subject
نکته اساسی, جزء اصلی
the essentials of English grammar