English Reference
noun

diligence

n.
US /ˈdɪɫədʒəns/ UK /dˈɪlɪdʒəns/ dili·gence UK spelling diligences

  1. 01 B2 Upper Intermediate

    careful and persistent work or effort.

    steady, earnest, and energetic effort; the quality of being industrious and hardworking over a sustained period.

    Simple

    Through hard work and diligence, she eventually became the manager of the company.

    In context

    The student's academic success was a direct result of her diligence, as she spent every evening reviewing her notes and refining her research.

    lazinessidleness
  2. 02 C1 Advanced FormalTechnical Law

    the care that you should take when doing a job or looking into something.

    the attention and care legally or ethically required of a person, especially in a professional or contractual context.

    Simple

    The lawyer performed due diligence to make sure the contract was safe to sign.

    In context

    The firm failed to exercise proper diligence in vetting the supplier, leading to a significant breach of safety protocols and subsequent legal action.

    Usage

    Often appears in the fixed phrase 'due diligence'.

    careattentionthoroughness
  3. 03 C2 Proficiency Archaic

    a large horse-drawn carriage used for public transport in the past.

    a public stagecoach, particularly a four-wheeled vehicle used in France and other parts of Europe before the advent of railways.

    Simple

    The travellers spent three uncomfortable days on the diligence as it crossed the mountains.

    In context

    Before the expansion of the rail network, the diligence remained the primary mode of long-distance transport for the middle classes across the continent.

For trusted journalists, diligence meant spending more time with the community.

The Conversation· 20 Aug 2026

Since then none of the contracts have been confirmed, with ministers saying "due diligence" is still being carried out.

BBC News· 18 Aug 2026

Borrowed from French diligence, from Latin diligentia.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin diligentia
Level B2 · Upper Intermediate
Frequency Frequent
Updated