ADVENT

[noun] [U] - the (future) arrival (of an event, invention, person, etc.)Quills were the chief writing implement from the 6th century AD until the advent of steel pens in the mid 19th century.Life in Britain was transformed by the advent of the steam engine.For Christians, Advent is the period of four weeks before Christmas.An Advent calendar is a decorative piece of card, often hung on the wall, which has a small door-like opening for each of the days of the month before Christmas. People, esp. children, open one of these doors each day, finding a picture under it.