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in·dis·pen·sa·ble

indispensable

 
pronunciation:
In dih spen s bl
part of speech: adjective
definition: absolutely necessary; essential.
A calculator is indispensable for this math class.
synonyms:
essential, necessary, required, vital
similar words:
basic, fundamental, imperative, important, needed
derivations: indispensably (adv.), indispensability (n.), indispensableness (n.)