1. Occurring ever half hour

1. Every thirty minutes, every half hour

See also: periodic, periodical

• Social Development Commission
• rope bridge
• rope burn
• rope down
• rope in
• rope ladder
• rope off
• rope tow
• rope up
• rope yard
• rope yarn
• rope-a-dope
• ropeable
• ropebark
• ropedancer
• ropemaker
• roper
• ropewalk
• ropewalker
• ropeway
• ropey
• rophy
• ropiness
• roping
• ropy