assiduous - WordReference.com Dictionary of English

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- - asses
  - asses' bridge
  - assess
  - asset
  - asset-backed
  - asset-stripping
  - asseveration
  - asshole
  - assibilate
  - assiduity
  - assiduous
  - assign
  - assignation
  - assignee
  - assignment
  - assimilate
  - assimilationist
  - assist
  - assistance
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assiduous

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Concise Oxford English Dictionary © 2008 Oxford University Press:
assiduous /əˈsɪdjʊəs/

▶adjective showing great care and perseverance.

– derivatives
assiduously adverb,
assiduousness noun.

– origin C16: from L. assiduus, from assidere (see assess), + -ous.

'assiduous' also found in these Oxford entries:

assiduity - diligent - ferret

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