A detailed revision and refinement of the "semantic theory of metaphor, " this book provides a comprehensive philosophical theory explicating metaphor's cognitive contribution. According to the author, metaphor effects a transference of meaning, not between two terms, but between two structured domains of content, or "semantic fields." Semantic fields, construed as necessary to a theory of word-meaning, provide the contrastive and affinitive relations that govern a term's literal use. In a metaphoric use, these relations are projected into a second domain which is thereby reordered with significant cognitive effects. Amply illustrated with sensitive and systematic analyses of metaphors found in literature, philosophy, science, and quotidian language, this book forges a new understanding of the relation between metaphoric and literal meaning.