Al-Qur’an literally means ‘The Recitation’, and is an excerpt from the Book of Knowledge, Book of Records, Book of Nature or Master Plan – an allegorical representation. The Quran is a compilation, an explanation, and a reading within, and of, this Book
85:21 in fact, this is an exalted, sublime compilation and recitation (Quran)
85:22 within the preserved, imperishable tablet
This needs to be understood along with other verses as well.
10:37 And it was not for this Quran to be produced by other than Allah, but [it is] a confirmation of what was before it and a detailed explanation of the Book, about which there is no doubt, from the Lord of the worlds.
The Book (of Nature), about which there is no doubt, is explained via prior revelations, and culminates within the Quran.
12:1 These are the signs of the clear Book
12: Indeed, We have sent it down as an Arabic (clear, plain, distinct) Quran (compilation, reading) so that you may understand
13:39 Allah eliminates what He wills or confirms, and with Him is the Mother of the Book.
So umm-ul-Kitab is the mother of the book (Book of Records, Book of Nature or Master Plan) with Allah. From it is comes the revelation to the prophets; thus, the Quran is the collection, compilation, explanation and recitation of it.