to mediate (the usual word)

think deeply about

to understand (something) fully

understand

to prepare (something) by mixing things together

formulate, think up

to put together materials, parts, to make (a building or similar structure)

assemble, build

to estimate (something not known) (from known data, information)

infer

to form a picture or idea of (something) in the mind; to think of (something) as probable

dream up, conceive

to make or design (something not existing before); to make up, think of, (something) for the first time

create, think up

to say, tell, something in advance

express an outcome in advance

planned but not yet carried out

plan

to be fully conscious of, understand, (something); to exchange (property, business shares etc) for money

appreciate, become aware of

an occasion of careful thought; to use the mind in order to consider, form opinions, decide; to consider, believe (something); to expect (something)

believe; anticipate

to imagine (something) as a picture

make a picture of in the mind