Necessary
/nˈɛsəˌsɛri/
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Definition
(adj) Required, essential, whether logically inescapable or needed in order to achieve a desired result or avoid some penalty.
Sentence Examples
You have bought more postage stamps than are necessary.
It is necessary for you to see a doctor at once.
CEFR Practice Quiz
It is ____ to bring your passport if you are traveling to another country.