لَيْلَةِ
A word in the Arabic language will either be 1) a verb or 2) a noun or 3) a particle – لَيْلَةِ is a noun
A noun may either be 1) Definite or indefinite 2) Masculine or feminine 3) Singular, dual or plural 4) Nominative, accusative or genitive
الَّيْلَةُ is the natural state of this definite noun and becomes الَّيْلَةِ due to: 1) a preposition that precedes it or 2) a possessed noun that precedes it or 3) it’s a noun of dependent declension a) نَعْتٌ / صِفَطٌ adjectives b) التَّوْكِيْدُ emphatic c) المَعْطُوْفٌ conjunction d) البَدَلُ synonym
الَّيْلَةِ loses it’s definite article, becoming لَيْلَةِ due to it being a possessed noun
Night
| الْمَعْرِفَةُ | مُفْرَدٌ | مُؤَنَّثٌ | مَجْرُوْرٌ | ل ي ل | بَابٌ | فَعْلَةٌ | اسْمٌ | الْمَصْدَرُ | |
| Definite | Singular | Feminine | Genitive | Root | Night | Pattern | Noun | Verbal noun | |
| مَصْدَرُ الْمَرَّةِ | |||||||||
| Surah/ | Below is the only verse in the holy Quran containing the genitive, possessed noun | لَيْلَةِ |
| Verse | ||
| 97-1 | Truly, We have sent it down in the night of Qadr | إِنَّآ أَنْزَاْنَاهُ فِي لَيْلَةِ القَدْرِ |