The cervix is a tubular structure.
Dilatation is the increase in the diameter of the cervix.
Both are required for a vaginal delivery to occur. Normally in the first pregnancy dilatation is preceeded by effacement. In subsequent deliveries they may occur simultaneously. Funneling as the name suggests is when the cervix takes a funnel shape. Funneling is very significant if you are less than 36 completed weeks as premature labour could set in if not acted upon immediately.