Necessary | Mean of necessary in English Dictionary

/ˈnɛsəˌseri/

• so important that you must do it or have it
1. Is it really/absolutely necessary for me to have surgery?
2. The threat of a thunderstorm made it necessary to cancel the picnic.
3. It's not necessary to wear a tie.
4. Food is necessary for life.
5. We had all the necessary ingredients.
6. Apply another coat of paint if necessary. [=if it is needed]
7. Take as much time as necessary. [=as much time as you need]
8. She took the medicine only when absolutely necessary.
9. a medically necessary procedure
• unable to be changed or avoided
1. Higher prices are a necessary consequence of the company's new services.
2. There is no necessary connection between what is legal and what is moral. [=what is legal does not always have to be moral and what is moral does not always have to be legal]
• Noun
• things (such as food, a place to live, and clothing) that you must have
1. We need the necessaries [=(more commonly) necessities] of life (to survive).

• whatever is needed for some purpose
1. I'll do the necessary [=do whatever is necessary] to get the job done.