This paper aims to investigate the usage and frequency of what we refer to as K-suffixes in ClassicalNew Persian of the ninth to thirteenth centuries, Contemporary Written Persian of the late nineteenth to mid-twentieth centuries, and Contemporary Spoken Persian. It shows that K-suffixes are most likely to be the reflexes of earlier evaluative morphemes, traditionally called “diminutives,” and are characterized by a high degree of multifunctionality. While evaluative functions continue to dominate in the Classical New Persian works, they have largely been lost in contemporary spoken Persian, and the suffix is now systematically used to express definiteness. The development of the K-suffix as a definiteness marker in contemporary colloquial ...