This book presents research into various types of professional discourse through the prism of the functional linguistics approach. Focusing mainly on practical aspects of speech, the book discusses various topics, such as structural, semantic, cognitive and pragmatic characteristics of professional discourse, argumentation strategies, humour in professional discourse, and word-building processes. It also highlights communicative effectiveness methods in professional discourse. Offering new ideas and discussing the latest findings, the book is intended for researchers, lecturers and professionals in the field.