(marketing) A week that is in high demand because it is in a holiday high season. Especially used in time-share, but not limited to this industry.

(marketing) A week that is in low demand because it is in a holiday low season. Especially used in time-share, but not limited to this industry.

(UK, Canada) A week during a university's term where no teaching takes place, generally so that students may prepare for tests. / (Canada) A spring break; often specifically the March break.

Any of several extended holidays celebrated in China and Japan, usually early in May.

(business, marketing) The period after Christmas (December 25th) until New Year's (or longer), when stores offer large discounts

(chiefly US, idiomatic) The week during which new members are required to undergo undignified rites of initiation or gruelling discipline in order to be accepted into a fraternity, sorority, secret society, military group, etc.

Alternative form of hell week

(Australia) A festival during which finishing high school students celebrate the end of their studies, and associated freedom.

In the calendar reform, a week added to usual 52, such that every year starts on the same day

A period of seven years.