- The definition of a dossier is a file or collection of information and details about a particular person or subject.
An example of a dossier is a comprehensive collection of files and information about a new employee you are considering hiring.
dossier definition by Webster's New World
Origin: French ; from dos, the back ; from Classical Latin dorsum: so named because labeled on the back
dossier definition by American Heritage Dictionary
Origin: French, from Old French, bundle of papers labeled on the back, from dos, back, from Latin dorsum.