The theory of expressive power of words (Saktivada) is the most important work on the signification of word. It deals with word, its signification and its meanings. While word (sabda) is a distinct means of knowledge (Pramana), signification (Vrtti) such as expressive power is a relation between word and its meaning (Pada Padartha Sambandha), also word-meaning (Padartha) is generic property, form and individual (yatyakrti vyaktayah). Gadadhara admits signification two fold as expressive power (Sakti), and indication (laksana). While the Pracyas admitted expressive power to be convention of God, the Navyas admitted the same to be convention of speaker in general. The theory of expressive power of word (Saktivada) is divided into three chapters, viz. the Samanya kanda, the Visesa Kanda and the Parisista Kanda. The Samanya Kanda deals with expressive power in word meaning i.e. in generic property, form and individual (Jaty akrti vyaktayah) in general the Visesa Kanda deals with expressive power in meanings of specific words such as ether (akasa) also, the Parisista Kanda deals with the Navyas position that expressive power of word in individual as qualified by generic property and form. The present volume contains English translation of the Saktivada of Gadadhara with critical notes and erudite introduction. Thus, it is a collectors item.