There are a number of common definitions of Knowledge Management. Here are a two of them.
*Knowledge Management (KM) is the process of capturing, developing, sharing, and effectively using Organisational knowledge*. Wikipedia
*Knowledge management is a discipline that promotes an integrated approach to identifying, capturing, evaluating, retrieving and sharing all of the enterprises information assets. These assets may include databases, documents, policies, procedures, and previously uncaptured expertise and experience in individual workers* Knowledge World.
What is common about each of them that the IT Architect has to recognise is the full life cycle of the information from identifying the need, capturing and delivering the information in the right context.