ج ن نcovering

الجنة · al-janna · Paradise; a garden

• Met in: V1 p9 ¶1f: «فبينه وبين الأنبياء في الجنة درجة واحدة», "between him and the prophets in Paradise there is a single degree". Already a key term on V1 p8 ¶4a.
• Dictionary form: جَنَّة. Lane: "A [garden, such as is called] busotaAn … or any bstAn having trees by which the ground is concealed"; "then, with the article Al, [Paradise,] the abode of recompense".
• Pattern: فَعْلَة (faʿla), from the root of covering: Lane says it is "as though it were originally the inf. n. of un. of jan~ahu, and meaning 'a single act of veiling' or 'concealing'". The plural is جَنَّات, the Quran's "gardens" (2:25).
• Meaning here: Paradise, where the one who dies seeking knowledge to bring Islam to life stands one rank below the prophets.

Ibn Faris, Maqāyīs al-Lugha, root جنن, vol 1, p 421

الجيم والنون أصل واحد، وهو [الستر و] التستر. فالجنة ما يصير إليه المسلمون في الآخرة، وهو ثواب مستور عنهم اليوم

One origin: covering and being covered. So al-janna is where the Muslims go in the Hereafter: a reward covered from them today. He goes on: a garden is called janna too, "because the trees cover with their leaves".

Urdu bridge

جنت (Paradise) is Urdu. From the same root of covering: جن (the jinn, hidden from sight) and جنون, مجنوں (madness: the mind covered over). (to be confirmed)

Quran

201 words from this root (Quranic Arabic Corpus). Most common: جَنَّة (garden, Paradise) ×147, جِنّ (jinn) ×22, مَجْنُون (madman) ×11.

وَٱلَّذِينَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّٰلِحَٰتِ أُو۟لَٰٓئِكَ أَصْحَٰبُ ٱلْجَنَّةِ هُمْ فِيهَا خَٰلِدُونَ

But they who believe and do righteous deeds - those are the companions of Paradise; they will abide therein eternally.

Surah Al-Baqara (2), ayah 82 · Saheeh International

Why this ayah: «أَصْحَٰبُ ٱلْجَنَّةِ», "the companions of Paradise": the word with the article, as on V1 p9 ¶1f.

In the Ihya

الجنة: 836 times in the Ihya.