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English definition of “indispensable”

indispensable

adjective     /ˌɪn.dɪˈspen.sə.bl̩/
C2 Something or someone that is indispensable is so good or important that you could not manage without it or them: This book is an indispensable resource for researchers. His long experience at the United Nations makes him indispensable to the talks.Essential or necessary indispensability     /ˌɪn.dɪ.spen.sɪˈbɪl.ɪ.ti/ US  /-ə.t̬i/ noun [U] Very important or urgent
(Definition of indispensable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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