Definition

1. Adjective:

   • Occurring every thirty minutes: Describes something that happens or is scheduled at intervals of half an hour.

2. Adverb:

   • Every thirty minutes, every half hour: Indicates the frequency with which an action occurs, repeating at 30-minute intervals.

Usage Examples

• Adjective:

  • The factory has half-hourly safety checks. (The safety checks are scheduled to occur every 30 minutes.)
  • We receive half-hourly updates on the storm's progress. (Updates are provided every half hour.)

• Adverb:

  • The buses on this route run half-hourly. (Buses depart every 30 minutes.)
  • Data is collected half-hourly from the weather station. (The collection happens every half hour.)

Advanced Usage

• "on a half-hourly basis": A more formal phrase meaning "every half hour".
  • Reports are generated on a half-hourly basis. (Reports are produced every 30 minutes.)

Variants and Related Words

• Hourly (adj/adv): Occurring or done every hour.
  • The news is broadcast hourly.
• Half-hour (n): A period of thirty minutes.
  • The meeting was delayed by a half-hour.

Synonyms

• Every thirty minutes
• Every half hour
• Semi-hourly (less common)

Notes on Meaning

• The word half-hourly specifically denotes a regular, repeating interval of 30 minutes. It is commonly used for schedules, transportation, data reporting, and broadcasts.

Adjective

1. occurring ever half hour

Adverb

1. every thirty minutes, every half hour