definition of
obstacle

[1] #1 obstacle n. [obstruction] 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 suc. wn

[2] #2 obstacle n. an obstruction that stands in the way (and must be removed or surmounted or circumvented). wn