Regarding or concerning.
To the purpose; appropriately.
By the way.
Timely; at a good time.
Of an appropriate or pertinent nature.
by the way, incidental
In the surrounding ambience.
Unsupported and liable to be turned or taken in flank.
Not in a fixed or stable position; unsettled; up in the air.
Prevalent without traceable origin or authority.
In the generally prevailing feeling, idea, atmosphere, or mood.