Threeday

Threeday is a term that can refer to several related concepts, all centered on a span of three days. In general usage, it describes a period of three consecutive days. When used as an adjective before a noun, the standard form in English is three-day (with a hyphen), as in a three-day event, a three-day weekend, or a three-day sale. The single-word variant threeday is less common in ordinary prose and appears mainly in branding, domain names, or stylized titles.

As a time interval, a three-day window is used in planning, logistics, and scheduling to delimit deadlines, review periods, or promotions. In marketing and retail, a three-day sale is a common promotional format encouraging rapid customer response.

As a proper noun, Threeday or ThreeDay may be adopted as a brand name for products, services, conferences, or entertainment events. Because it is not unique to a specific entity, its meaning depends on context and capitalization.

See also: three-day weekend; three-day event; three-day rule; three-day pass.