: a circumstance, quality, or person that has a strong but unpredictable influence
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Foto Olimpik—NurPhoto/Getty Images Petrosian, who is currently fifth after the short program, is the Russian national champion for the third year in a row and the X factor in the competition.—Alice Park, Time, 18 Feb. 2026 And that’s the X factor of La Dolce Vita.—Adam Erace, Travel + Leisure, 6 Feb. 2026 But in a messy world, with all those unpredictable X factors, leaders would do better to foster ingenuity, grit, and perseverance.—Claire Zillman, Fortune, 28 Jan. 2026 That’s critical because the biggest X factor is regulatory approval.—Brian Stelter, CNN Money, 5 Dec. 2025 See All Example Sentences for X factor