A new series...

First of all, the word of the day is Recognizance.

recognizance noun
Law a bond by which a person undertakes before a court or magistrate to observe some condition, esp. to appear when summoned : he was released on his own recognizance.

I find this word particularly interesting because the sentence used to illustrate its context in the provided definition is essentially the only time the word is ever used, to my knowledge.