developing country
US /dɪˈvel.ə.pɪŋ ˈkʌn.tri/
UK /dɪˈvel.ə.pɪŋ ˈkʌn.tri/

1.
a country with a less developed industrial base and a low Human Development Index (HDI) relative to other countries
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Many international organizations provide aid to developing countries.
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Improving education is crucial for the growth of developing countries.