Strikingly appropriate or relevant; well suited to the circumstance or in relation to something.
Positioned at rest in respect to another, be it side-to-side, front-to-front, back-to-back, or even three-dimensionally: in apposition.
Related, homologous.
That which is apposite; something suitable.
Deeply or seriously thoughtful.
Broody; incubating eggs by sitting on them.
A spell of brooding; the time when someone broods.