This week we will introduce the terms, words, names and acronyms used in Libre Software and Libre Knowledge. Promoting correct use of terminology will allow us to better understand and explore the concepts particular to our studies throughout the course. The main words we will come across are "free, libre and open", they are often used interchangeably and to mean the same thing but its not always the case. We will establish correspondences between terms in the various languages, analyze the concepts and identify the terms assigned to the concepts.