Longman Dictionary of Contemporary English homepage

dependence

 noun
     
de‧pen‧dence also dependency [uncountable]
1 when you depend on the help and support of someone or something else in order to exist or be successful [≠ independence]
dependence on/upon
our dependence on oil as a source of energy
the financial dependency of some women on men
2

drug/alcohol dependence

MDD when someone is addicted to drugs or alcohol
3 technical when one thing is strongly affected by another thing
dependence of
the mutual dependence of profit and growth
Definition from the Longman Dictionary of Contemporary English
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