Final answer:
The OOTB feature that provides an easy way of linking definitions within other definitions is called hyperlinking.
Step-by-step explanation:
The Out-of-the-Box (OOTB) feature that provides an easy way of linking definitions within other definitions is called hyperlinking.
Hyperlinking is a feature that allows users to navigate directly to related information by clicking on a link within a document or webpage. In the context of definitions, hyperlinking can be used to connect terms to other terms or references within the document or to external sources of information.
For example, if a definition includes a technical term that may need further explanation, a hyperlink can be added to connect it to a separate definition or a relevant website or resource that provides more information on that term.