سَعْيِ

A word in the Arabic language will either be 1) a verb or 2) a noun or 3) a particle – سَعْيِ 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

سَعْيٌ is the natural state of this indefinite noun and it becomes سَعْيٍ 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

سَعْيٍ loses it’s indefinite article, becoming سَعْيِ due to it being a possessed noun

The act of going quickly or hastily; Endeavour; Age of running or work and assist

To strive, go quickly, exert, endeavour, hasten, act, run, be active, diligent

نَكِرَةٌمُفْرَدٌمُذَكَّرٌمَجْرُوْرٌس ع يبَاب فَتَحَسَعَى يَسْعَىفَعْلٌاسْمٌالْمَصْدَرُ
IndefiniteSingularMasculineGenitiveRootEndeavourفPatternNounVerbal noun
Surah/Below are the 2 verses in the holy Quran containing the nounسَعْيِ
Verse
21-94
88-9glad with their endeavorلِّسَعْيِهَا رَاضِيَةٌ