竞赛 (jìng sài) is a noun meaning 'contest' or 'competition' — an organized event where individuals or teams compete to win based on skill, speed, knowledge, or performance. The character 竞 (jìng) means 'to compete' or 'to vie,' conveying the idea of striving against others; 赛 (sài) means 'to compete' or 'a match,' often implying a formal or structured contest. Together, they form a compound word emphasizing fair, rule-based rivalry, commonly used in academic, sports, and professional settings.

Unlike casual terms like 比赛 (bǐsài), which can refer to any informal match, 竞赛 carries a slightly more formal, institutional, or official connotation — it’s frequently seen in contexts like school science fairs, national Olympiads, coding hackathons, or workplace innovation challenges. It’s rarely used for spontaneous or playful competition, and never for natural phenomena or non-human rivalry (e.g., animal behavior), making it distinct from broader terms like 竞争 (jìngzhēng, 'competition' in a general, often abstract sense).