1. closure or blockage (as of a blood vessel)

Definition categories: state, attack

2. (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft

Definition categories: phenomenon, front

3. (dentistry) the normal spatial relation of the teeth when the jaws are closed

Definition categories: attribute, position

4. an obstruction in a pipe or tube

Similar word(s): block, blockage, closure, stop, stoppage

Definition categories: man–made, impediment, impedimenta, obstructer, obstruction, obstructor

5. the act of blocking

Similar word(s): blockage, closure

Definition categories: act, obstruction