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Meaning of “decompose” in the English Dictionary

"decompose" in British English

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decomposeverb [I or T]

uk   /ˌdiː.kəmˈpəʊz/  us   /ˌdiː.kəmˈpoʊz/
to decay, or to cause something to decay: The body must have been decomposing for several weeks.
specialized chemistry to break, or to break something, into smaller parts: Microbes decompose organic waste into a mixture of methane and carbon dioxide.
decomposition
noun [U] uk   /ˌdiː.kɒm.pəˈzɪʃ.ən/  us   /ˌdiː.kɑːm.pəˈzɪʃ.ən/
The corpse was in an advanced stage of decomposition.
(Definition of decompose from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"decompose" in American English

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decomposeverb [I/T]

 us   /ˌdi·kəmˈpoʊz/
to destroy something by breaking it into smaller parts: [I] Certain kinds of plastic decompose quickly.
biology If dead plant or animal material decomposes, it decays.
chemistry If a substance decomposes it separates into its parts.
decomposition
noun [U]  /ˌdiˌkɑm·pəˈzɪʃ·ən/
(Definition of decompose from the Cambridge Academic Content Dictionary © Cambridge University Press)
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“decompose” in British English

“decompose” in American English

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