English to English
1. something immaterial that stands in the way and must be circumvented or surmounted
lack of imagination is an obstacle to one's advancement|the poverty of a district is an obstacle to good education|the filibuster was a major obstruction to the success of their plan
2. an obstruction that stands in the way (and must be removed or surmounted or circumvented)
3. That which stands in the way, or opposes; anything that hinders progress; a hindrance; an obstruction, physical or moral.