Not involving the quickest, shortest, or most convenient path
Not of obvious or immediate cause, but as a secondary result
Not focused straight at the target or subject, but by more subtle means
To access by means of indirection; to dereference.
An indirect cost.
An indirect radiator
Allowing movement in only one direction; unidirectional.
Allowing travel in only one direction.
To use a disc harrow to turn the soil and kill weeds, in preparation for planting seeds.