Both Uses of

contradict
in
The Poisonwood Bible

I haven't contradicted my father on any subject, ever.†
Chpt 1 *

contradicted = disagreed

I do not like to contradict, but in seventy-five years the only roads the Belgians ever built are the ones they use to haul out diamonds and rubber.†
Chpt 2

contradict = disagree

Definition:

disagree

in various senses, including:

to say something is not true -- as in "She contradicted his testimony."
to say something else is true when both can't be true -- as in "I don't believe her. She contradicted herself as she told us what happened."
to be in conflict with -- as in "Her assertions contradict accepted scientific principles."