cerebrate
conceive
conceptualize
consider
devise
entertain ideas
excogitate
exercise the mind
form ideas
give thought to
ideate
intellectualize
plan
ponder
puzzle out
reason
reason out
sort out
think
think about
think out
think through
chew over
contemplate
meditate
mull
mull over
muse
reflect
ruminate
speculate
think over
associate
brainstorm
center
centre
colligate
concentrate
conclude
connect
devote
evaluate
focus
give
judge
link
linkup
pass judgment
pay
philosophise
philosophize
pore
puzzle over
rationalise
rationalize
relate
rivet
study
tie in
cogitated
cogitates
cogitating
cogibundity
cogitation