رَّاضِيَةٍ

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

رَّاضِيَةٌ is the natural state of this indefinite noun and it becomes رَّاضِيَةٍ 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

One who is content, well pleased, pleasant, agreeable

To be pleased, satisfied, content, choose, consent to, prefer