It chanced one morning, while Oliver’s affairs were in this auspicious and comfortable state, that Mr. Gamfield, chimney-sweep, went his way down the High Street, deeply cogitating in his mind his ways and means of paying certain arrears of rent, for which his landlord had become rather pressing.
There are no more uses of "cogitate" in the book.
Show samples from other sources
But, exhausted by his cogitation, he’d have energy left for only one word, the name of the flower.
Gail Carson Levine -- Ella Enchanted
The average squirrel cogitation goes something like this: I wonder what there is to eat.