Final answer:
The legal term 'decrees' in the sentence from Brown v. Board of Education exemplifies legal jargon, relating to official court orders.
Step-by-step explanation:
The word in the sentence from Brown v. Board of Education that is an example of legal jargon is 'decrees'. This term refers to official orders issued by a legal authority, in this context by the court, and it is not commonly used outside the legal field. The sentence indicates the complexity involved in creating such orders due to the class-action nature of the case, its wide applicability, and the variety of local conditions affects how the decision would be implemented.