From Molly Hall,
Your Guide to Astrology.
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Definition:

An opposition occurs between planets exactly across from each other on the Chart wheel. The exact opposition would be planets at 180 degrees apart. But planets in opposition within close orb will have that energetic tension.

The opposition is considered a negative or stressful aspect, since it's a challenge of two opposing forces. But sometimes, like with any tense stand-off, opposing planets draw out the cumulative strengths, and have an anchoring effect.