Semantics has attained a prominent position in contemporary Qurʾānic studies and plays a significant role in uncovering the semantic layers of the divine verses. The present study is organized around the principal question: What are the semantic components of the root ajr in the Holy Qurʾān when examined in light of syntagmatic and paradigmatic relations? The research adopts a descriptive-analytical method based on a semantic approach, with particular focus on syntagmatic and paradigmatic relations within the context of Qurʾānic verses. The findings indicate that the word ajr in the Qurʾān occurs alongside fourteen syntagmatic associates, the most prominent of which are ʿaẓīm (great), kabīr (great/magnificent), and karīm (noble/generous). In addition, four paradigmatic substitutes namely thawāb, khayr, fawz, and jazāʾ have been used a total of ninety-three times. Examination of these data reveals that the semantic field of ajr encompasses such components as: the inclusion of both material and spiritual reward; extension across both worldly and otherworldly spheres; association with righteous action; attainability by human beings; correspondence to varying درجات of faith; consequentiality in relation to deeds; and its bestowed and certain character on the part of God. It may therefore be concluded that the semantic analysis of the root ajr discloses a rich and multilayered semantic system in the Holy Qurʾān—one that encompasses the individual, social, worldly, and eschatological dimensions of human life.