noun
cause of victory; reason for success
Used in analysis or commentary to explain why someone or something won or succeeded. Often appears in sports, business, or competitive contexts.
チームの勝因は、固い守りと速攻だった。
The team's cause of victory was its solid defense and quick attacks.
彼の勝因を分析すると、
Analyzing the reason for his success, thorough preparation can be cited.