النَّكِرَةُ مَا وُضِعَ لِشَيْءٍ غَيْرِ مُعَيَّنٍ.
Translation: An indefinite noun designates something not specifically determined.
Kitābun refers to a book, not to a previously identified book.
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Definition of Nakirah
Conclusion: Definite and Indefinite Nouns
النَّكِرَةُ مَا وُضِعَ لِشَيْءٍ غَيْرِ مُعَيَّنٍ.
Translation: An indefinite noun designates something not specifically determined.
Kitābun refers to a book, not to a previously identified book.