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

Encyclopedia: Irish Standard Time

• acromion
• acromphalus
• acromyotonia
• acronym
• acronymic
• acronymous
• acropetal
• acrophobia
• acrophobic
• acrophony
• acropolis
• Acropora
• acroscopic
• acrosome
• across
• across the country
• across the nation
• across-the-board
• acrostic
• Acrostichum
• Acrostichum aureum
• acrotic
• acrylamide
• acrylate
• acrylate resin