Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: French
Origin: Latin, present participle of diligere 'to put high value on, love'

diligent

 adjective
     
dil‧i‧gent
someone who is diligent works hard and is careful and thorough:
a diligent student
—diligently adverb:
They worked diligently all morning.
—diligence noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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