So many definitions of the term literacy exist that it would be a much larger task than this post to list and categorise them. CILIP has assembled a broad collection. My own understanding of the term is that it has evolved over time and continues to be adapted and modified to suit new technologies, contexts and purposes. In its current use, the term seems to indicate capability, understanding, command of a skill or set of skills, ability to use and understand a particular process or concept. By way of an example, “digital literacy” indicates an ability to use  and understand digital technologies and environments. The ability to operate the technology and turn it efficiently and effectively to one’s own purpose. The term will continue to be adapted to suit the ever changing fields of human endeavour but I believe it will remain used to refer to the making and expressing of meaning and understanding in any and all forms.