obstruction-n; 3 Senses

Sense Number 1: a thing, concrete or abstract, which is an obstacle

Commentary: OBSTRUCTION[+structure][+obstacle][+physical/+abstract]
NOTE: implies an existing thing or situation, not a specific action (see Sense 2)
NOTE: usually refers to the one who must confront the obstacle

Examples:
John drove carefully around the obstruction in the middle of the road.
Bars on windows are effective obstructions to home intruders.
His basic insecurity has been an obstruction to getting a better job. (figurative)

Mappings:

Sense Number 2: an action or maneuver that hinders someone/something

Commentary: OBSTRUCTION[+action][+maneuver][+hindering]
NOTE: implies an agent performing an action
NOTE: refers to the one creating a hindrance or obstacle

Examples:
They will use the filibuster as an obstruction to getting the bill passed. (political act)
His destruction of the evidence is interpreted as an obstruction of justice.
The referee gave a penalty to the player for his obstruction of the ball.

Mappings:
WordNet 3.0 Sense Numbers: 4, 5

Sense Number 3: a physiological state of blockage

Commentary: OBSTRUCTION[+state][+physiological][+blocked]

Examples:
The doctor determined the patient had an obstruction in the lower intestines.
Before attempting mouth-to-mouth resuscitation, remove any obstructions from the victim's throat.
Chicken bones can create obstructions in dogs' bowels.

Mappings:
WordNet 3.0 Sense Numbers: 2