interrelate

verbs

be in a relationship with
"How are these two observations related?"
is derived from
place into a mutual relationship
"I cannot interrelate these two events"
is derived from
verb group
be in a relationship with
"How are these two observations related?"
is a type of (narrower)
make a logical or causal connection
"I cannot connect these two pieces of evidence in my mind"; "colligate these facts"; "I cannot relate these events at all"