A working definition:
Technology is the disciplined arrangement of knowledge, tools, methods, and materials into a repeatable means of doing something.
Or, in a more philosophical form:
Technology is the way intelligence becomes embodied in tools, systems, and procedures so that an intention can act reliably in the world.
For your work, I would shape it like this:
Technology is not merely machines. It is any constructed means by which a being extends capacity: to reach, remember, measure, carry, transform, communicate, protect, or organize.
That gives you several layers:
Stone tool — technology as extension of the hand.
Writing — technology as extension of memory.
Roads and ships — technology as extension of movement.
Clocks and calendars — technology as extension of time-ordering.
Computers and networks — technology as extension of thought, relation, storage, and transmission.
A strong compact version for your relational mechanics might be:
Technology is the extension-structure by which beings turn knowledge into repeatable action.
Or more kingly:
Technology is the craft by which intelligence gives itself a body in the world.