base
Definitions
The lowest part or edge of something, especially the part on which it rests or is supported.
A conceptual structure or entity on which something draws or depends; a foundation.
The main ingredient or starting point of a mixture, preparation, or system.
Examples
The soldiers returned safely to their base after the mission.
You should always base your decisions on facts rather than emotions.
The lamp has a heavy metal base to keep it from tipping over.