Required: adj. and nm (word from the Latin necessarius).
The word “necessary” has many meanings:
I) Adjective:
1. Said of a condition, a means whose presence or action alone makes possible an end or an effect.
Necessary and sufficient condition (example: for a quadrilateral to be a rectangle, two of its successive angles are right).
The amount needed to buy a car.
Impersonal: It is not necessary to hope to undertake.
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