This article investigates definiteness and its interactions with demonstratives and number in Laki (Northwestern Iranian). By the examination of demonstratives and building upon previous proposals, I argue for two types of definite DPs in Laki, namely anaphoric and deictic. I show that the patterns of definite and number marking are sensitive to the type of the DP. In particular, I argue that double definiteness, resulting from an Agree relation between D and N, and head movement of Num to D both are obtained only in anaphoric definite DPs for feature-checking requirements. Overall, this study highlights the contributions of anaphoricity to the DP internal structure. The present proposal can account for similar phenomena in other Iranian languages (i.e., Sorani and Kermanshahi Kurdish). The divergence of Laki definiteness from similar attested patterns (i.e., Scandinavian double definiteness) contributes to our cross-linguistic understanding of definiteness and its interactions with other nominal elements.
