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I don't want to be disturbed unless it's absolutely necessary.
basic foods regarded as necessary for health
What type of clothing is necessary for survival at these altitudes?
It was necessary for all students to register a week in advance.
I can take your place at the meeting tomorrow if necessary.
We'll be adding more workers as necessary (=as they are needed).
This is the American English definition of necessary. View British English definition of necessary.
the period of 40 days before Easter, starting on Ash Wednesday, when some Christians stop eating...