Definition

1. Adjective:
   • Occurring once every twenty years: Describes an event, celebration, or phenomenon that happens or is observed at intervals of two decades.
   • Lasting for twenty years: Pertaining to a period or duration of two decades.

Usage Examples

• Adjective:
  • The vicennial celebration of the city's founding attracted visitors from around the world.
  • The society holds a vicennial conference to review its long-term goals and progress.
  • A vicennial period is a significant span of time for demographic studies.

Advanced Usage

• Vicennial anniversary: A celebration marking twenty years since a particular event.
  • They planned a grand party for their vicennial wedding anniversary.
• Vicennial cycle: A recurring pattern or event that takes place every two decades.
  • The vicennial cycle of this astronomical event is well-documented.

Variants and Related Words

• Vicennially (adverb): In a vicennial manner; every twenty years.
  • The committee meets vicennially to elect new leadership.
• Biennial (adj.): Occurring every two years.
• Decennial (adj.): Occurring every ten years.
• Centennial (adj.): Occurring every hundred years.

Synonyms

• Twenty-year: Of or relating to a period of twenty years.
• Bidecennial: (Less common) Another term for occurring every twenty years.

Antonyms

• Annual: Occurring every year.
• Frequent: Occurring or appearing often.

Related Phrases

• Once in a generation: An idiom sometimes used to describe events that happen roughly every 20-30 years, overlapping with the concept of a vicennial event.
  • Such a comprehensive policy review is a once-in-a-generation undertaking.

Adjective

1. occurring once every 20 years