1 [count, noncount] : a crack or break in something (such as a pipe)
A rupture in the pipeline resulted in major water damage.
2 a : a break or tear in a part of the body
a rupture of an artery
an infection that could cause rupture of the eardrum
b [count] : hernia
3 [count] : a break in good relations between people or countries
The conflict caused a rupture in relations between the former allies.
They're trying to heal the rupture in their relationship.