勢い
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Base noun form. Describes physical force, energetic vigor, or the momentum of an action or situation. Can be used in expressions like 『勢いがある』 (ikioi ga aru, 'to have momentum').
Theme

During a team meeting at work, User and their colleague Aiko discuss how to maintain momentum on a challenging project.

勢い

いきおい

force / vigor / momentum

Advanced ExpansionAbstract Concepts

Memory Hook

Think of a 'say' (勢い ikioi sounds like 'I key oi') with great force — like a key turning with momentum! 'I key oi' → 勢い (ikioi, 'force / Vigor').

Cultural Note

『勢い』 (ikioi) is often used in sports and business contexts to describe momentum or drive, such as a team's winning streak or a company's rapid growth.

Forms

Base: 勢いBase noun form. Describes physical force, energetic vigor, or the momentum of an action or situation. Can be used in expressions like 『勢いがある』 (ikioi ga aru, 'to have momentum').