Definition of joinder in English:



  • [mass noun] The action of bringing parties together; union.

    ‘the joinder of parties’
    • ‘In such circumstances, as it seems to me, the demands of practical justice plainly favour joinder of Aramco.’
    • ‘That is to say, these very same prosecutors were at court on an application for joinder as parties and they elected not to make that application.’
    • ‘Additionally, this is not a case where Borchard and the third party Part 20 defendants made common cause as to joinder.’
    • ‘The second ground of power that I would rely upon is Order 16 rule 4 which is the rule permitting the joinder of necessary parties.’
    • ‘A similar approach may be detected when the late joinder of a party involves the other party in consequential additional expense.’


Late Middle English: from Anglo-Norman French, from Old French joindre to join.