Indispensable
/ˌɪndɪˈspɛnsəbəl/
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Definition
(adj) Absolutely necessary or requisite; that one cannot do without.
Sentence Examples
Air is indispensable to life.
Both air and water are indispensable for life.
CEFR Practice Quiz
Air and clean water are ____ for all forms of life to exist on our planet.