As a measure of time. A fourth part of a year; (formerly esp.) one of the four periods divided by the recognized quarter days (quarter day, n.)…

A quarter of a year, a period of three months; spec. a three-month term at school or university.

Of English words. Business and Finance. In form Q (without point). With reference to the financial year, with qualifying number: quarter (cf. quarter…

The half of a year; six months. As a space of time, expressed by half a year.