1. A form of daylight-saving time, one hour ahead of UTC, used in the United Kingdom, Ireland and mainland Portugal in summer
   - BST, Irish Standard Time, Western European Summer Time

Encyclopedia: British Summer Time

• open-door policy
• open-end credit
• open-end fund
• open-end investment company
• workflow
• workforce
• workhorse
• workhouse
• working
• working agreement
• working capital
• working day
• working dog
• working girl
• working group
• working memory
• working out
• working papers
• working party
• working person
• working principle
• working rule
• working week
• working-class
• workingman