> The kind of [[Definition|definition]] that conveys a concept by *pointing*. ^definition Rrather than by stating its meaning or listing its members. > "*That*, and *that*, are dogs." ^example Ostension is how knowledge that has never been written down still travels: its holder produces or recognises an instance on demand, but the recipient has to be present and nothing outlasts the holder. It is the immature rung beneath a written [[Intention|intension]], and the one mode an [[AI agent|agent]] cannot use - an agent can read a definition, not be pointed at a colleague.