1. Occurring ever half hour

1. Every thirty minutes, every half hour

See also: periodic, periodical

• pack off
• pack on
• pack riding
• pack tent
• pack together
• packable
• package
• package bomb
• package deal
• package holiday
• package store
• package tour
• packaged
• packaged goods
• packaging
• packaging company
• packaging concern
• packed
• packed cell volume
• packed cells
• packed lunch
• packer
• Packera
• Packera aurea
• psychodelic drug