FMS' answerFMS' answer to What are the positions relative to each other in the Catholic church's clerical hierarchy?What are the positions relative to each other in the Catholic church's clerical hierarchy? mentioned a twofold hierarchy in the Church, that of order and that of jurisdiction.
Given examples from the secular world, it is a bit easier to understand what is meant by jurisdiction.
The question is, what is meant by order and how did its usage come about?
Note:
Please note @curiousdannii's comment that Anglicans also have a three fold order of ordination and a book called the Ordinal. Perhaps the answer will speak to the Anglican meaning so long doing so will not make this post off-topic.