Etymology
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obstacle (n.)

"a hindrance, obstruction, impediment, or barrier; that which opposes or stands in the way," mid-14c., from Old French obstacle, ostacle "opposition, obstruction, hindrance" (13c.) and directly from Latin obstaculum "a hindrance, obstacle," with instrumental suffix *-tlom + obstare "stand before, stand opposite to, block, hinder, thwart," from ob "in front of, against" (see ob-) + stare "to stand," from PIE root *sta- "to stand, make or be firm."

The lover thinks more often of reaching his mistress than the husband of guarding his wife; the prisoner thinks more often of escaping than the gaoler of shutting his door; and so, whatever the obstacles may be, the lover and the prisoner ought to succeed. [Stendhal, "Charterhouse of Parma"]

Obstacle course "race course in which natural or artificial obstacles must be overcome" is attested by 1891.

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Definitions of obstacle

obstacle (n.)
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
Synonyms: obstruction
obstacle (n.)
an obstruction that stands in the way (and must be removed or surmounted or circumvented);
From wordnet.princeton.edu