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From The Collaborative International Dictionary of English v.0.48:
Joinder \Join"der\, n. [F. joindre. See Join, v. t.] [1913 Webster] 1. The act of joining; a putting together; conjunction. [1913 Webster] Confirmed by mutual joinder of your hands. --Shak. [1913 Webster] 2. (Law) (a) A joining of parties as plaintiffs or defendants in a suit. (b) Acceptance of an issue tendered in law or fact. (c) A joining of causes of action or defense in civil suits or criminal prosecutions. [1913 Webster]