half day UK US noun [C] WORKPLACE
► a day when people only work in either the morning or the afternoon, or when stores, businesses, etc. are only open in either the morning or the afternoon: »
She works Mondays, Wednesdays and a half day Fridays so she can spend more time with her two toddlers.
»Fees are £150 for a half day.
Financial and business terms. 2012.