noun
Definition 1
Morning or early shift, typically from 07:00 to 15:00 on the three-shift rota.
Source: Invertext
Context: To staff the first shift, it [the Kia car factory in north-west Slovakia] set up a bus line to transport workers from nearby Zilina.
Source: Financial Times 22/07/2008 (Jan Cienski in Zilina)