This is the 96th most frequent German word.
dieses
The German word "dieses" means "this" or "this one" (neuter singular).
Here, 'dieses' is used as a demonstrative pronoun in the neuter nominative singular form, modifying the noun 'Buch'.
Dieses Buch ist sehr interessant.
This book is very interesting.
Here, 'diesem' is the dative singular form of 'dieses,' used to describe the noun 'Projekt'.
Ich habe von diesem Projekt gehört.
I have heard about this project.
Here, 'diese' modifies the feminine singular noun 'Straße' in the accusative case as a demonstrative pronoun.