By the way.
To the purpose; appropriately.
Timely; at a good time.
Regarding or concerning.
Of an appropriate or pertinent nature.
by the way, incidental
As well.
Introduces the first of two (or occasionally more) options or possibilities, the second (or last) of which is introduced by “or”.
One or the other of two people or things.
Any one (of two).
Each of two; both.