What is "parties of the second part"

Usage examples of "parties of the second part".

The snag in this business of falling in love, aged relative, is that the parties of the first part so often get mixed up with the wrong parties of the second part, robbed of their cooler judgment by the parties of the second part's glamour.

There was no time to continue the discussion before the parties of the second part returned to face their accusers.

The parties of the second part and of the third part were interchangeable.

I mean, many a cove would no doubt edge into the final spasm of this narrative with a long description of Goodwood, featuring the blue sky, the rolling prospect, the joyous crowds of pickpockets, and the parties of the second part who were having the pockets picked, and - in a word, what not.