Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: 'tenth part', from Latin decima

dime

 noun
     
Related topics: Currencies
dime [countable]
1PEC a coin of the US and Canada, worth one tenth of a dollar
2

a dime a dozen

American English informal very common and not valuable [= ten a penny British English]
PhDs are a dime a dozen nowadays.
Definition from the Longman Dictionary of Contemporary English
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