opposition

noun

• resistance or dissent, expressed in action or argument:there was considerable opposition to the proposal the regime cracked down against the threat of opposition
• (often the opposition) a group of adversaries or competitors, especially a rival political party or athletic team.
• (the opposition) the principal political party opposed to the one in office.
• a contrast or antithesis:a nature-culture opposition
• Logic (of two propositions) the relation of having the same subject and predicate, but differing in quantity, quality, or both.
• Astronomy & Astrology the apparent position of two celestial objects that are directly opposite each other in the sky, especially when a superior planet is opposite the sun.