'Order' in the Bible

As he saith also in another place, Thou art a priest for ever after the order of Melchisedec.

Called of God an high priest after the order of Melchisedec.

Whither the forerunner is for us entered, even Jesus, made an high priest for ever after the order of Melchisedec.

If therefore perfection were by the Levitical priesthood, (for under it the people received the law,) what further need was there that another priest should rise after the order of Melchisedec, and not be called after the order of Aaron?

For he testifieth, Thou art a priest for ever after the order of Melchisedec.

(For those priests were made without an oath; but this with an oath by him that said unto him, The Lord sware and will not repent, Thou art a priest for ever after the order of Melchisedec:)