Here is a once common verb that seems
to haven fallen from our language. It means to take careful thought
or think carefully about. Also, to think earnestly or studiously;
reflect; ponder; meditate: as, to cogitate a means of escape. In
addition, to revolve in the mind; think about attentively; meditate
on; hence, devise or plan: as, he is cogitating mischief (something
I never did as a child).