Definition

Noun 1. A secret or mystery known only to a select few; esoteric knowledge: Information, knowledge, or a principle that is hidden, mysterious, and accessible only to a special, often initiated, group. 2. A specialized or proprietary secret: A closely guarded piece of knowledge, such as a formula, technique, or method, that is key to a particular practice, art, or profession.

Usage

The word "arcanum" is a formal and somewhat literary term. It is most often used in singular form, though the traditional plural is "arcana." It describes knowledge that is deliberately kept secret or is so profound that it is understood by very few.

Examples

• Noun:
  • The ancient manuscript was said to contain the arcanum of eternal life.
  • The master distiller guarded the arcanum of his family's whiskey recipe.
  • Alchemists of old sought the arcanum for transforming lead into gold.

Advanced Usage

• "The great arcanum": Often used to refer to the ultimate secret or most profound mystery in a particular field of esoteric study.
  • For many philosophers, the nature of consciousness remains the great arcanum.
• Used in the plural form "arcana" to refer to a body of secret knowledge or mysteries.
  • He spent his life studying the arcana of mystical traditions.

Variants and Related Words

• Arcane (adj): Understood by few; mysterious or secret.
  • The scholar was an expert in arcane languages.
• Arcana (n, plural): The plural form of arcanum, referring to secrets or mysteries collectively.

Synonyms

• Secret: Something kept hidden or unexplained.
• Mystery: Something that is difficult or impossible to understand or explain.
• Esoterica: Items or ideas that are obscure and understood by only a small group.

Antonyms

• Common knowledge: Information known by the public.
• Public domain: Information freely available to everyone.

Related Idioms and Phrases

• "The arcanum of...": A phrase used to specify the field of the secret knowledge.
  • She possessed the arcanum of the old healing arts.

Noun

1. information known only to a special group
   • the secret of Cajun cooking