(US) The week leading up to homecoming, during which school students dress up in unusual themed clothing.

Synonym of technical week

The week prior to the opening night of a play, musical, etc., during which technical elements such as costumes, lights, sound, set and makeup are tested during rehearsal.

(business) A week of low employee absenteeism.

Synonym of reading week

(Oxford University) Alternative form of noughth week.

(Oxford University) The week before the first week of an academic term, when many undergraduates arrive from home.

(astronomy, physics) A unit of length equal to the distance light travels in one week.

(university slang, Canada) A week of activities dedicated to new students at a college or university, held to prepare them for their first academic year.

(university slang) Abbreviation of Orientation Week.