example / model / role model
Feminine noun. Also written قُدْوَةٌ (qudwah) in some dialects. أُسْوَةٌ حَسَنَةٌ (excellent example) is a key Quranic phrase.
This verse establishes the Prophet ﷺ as the living model of Quranic ethics - his Sunnah (practice) is the practical application of Quranic principles.