Current theories of meaning - from Saussure through Grice, Gadamer, and speech-act theory - treat communication as compression: a structured situation flattened into words, partially reconstructed by the listener. This book argues that AI-mediated communication constitutes a qualitatively different operation: *transduction*, a structure-preserving mapping between non-identical context-models, in which meaning is carried as relational topology rather than lexical content. Drawing on Peircean semiotics, distributed cognition, and computational pragmatics, the framework introduces a five-dimensional field model (situational content, causal-temporal structure, goals, interpersonal relations, epistemic status) and applies it across twelve case studies spanning aphasia recovery, cross-linguistic mediation, institutional communication, and clinical follow-up. The analysis yields four falsifiable theses - on transduction, substrate-independence, compression-override, and distributed authorship - alongside design principles for transparency, speaker veto, and field-depth symmetry. The book is written for researchers in philosophy of language, HCI, and AI ethics, and for informed practitioners working at the intersection of computational systems and human meaning-making.
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