Definition

1. Noun:
   • A set of four similar things considered as a unit: "Quadruplet" can refer to a group of four identical or similar items that form a single entity.
   • One of four children born at the same time from the same pregnancy: In human biology, "quadruplet" refers to one individual in a set of four siblings born from a single pregnancy.
   • The cardinal number that is the sum of three and one: In mathematics, "quadruplet" can denote the number four itself.

Usage Examples

• Noun (Set of four):
  • The museum acquired a rare quadruplet of ancient vases.
  • The data was analyzed as a quadruplet of related measurements.
• Noun (One of four siblings):
  • She is a quadruplet; she has three sisters born at the same time.
  • The quadruplets celebrated their birthday together.
• Noun (The number four):
  • In this sequence, a quadruplet represents a complete cycle. (This usage is less common and more technical.)

Advanced Usage

• "to give birth to quadruplets": to have four children from a single birth.
  • The couple made headlines when they gave birth to quadruplets.
• "a quadruplet of": used to describe a group or set of four specific items.
  • The composer wrote a quadruplet of symphonies in his final year.

Variants and Related Words

• Quadruplets (n, plural): The more common form, specifically referring to the four children born together.
  • The quadruplets are all healthy.
• Quad (n, informal): A common shortened form, especially when referring to the siblings or a group of four.
  • She's one of the quads.
• Quadruple (adj): Consisting of four parts or members; fourfold.
  • The company reported quadruple profits.
• Quadruplicate (n/adj): One of four identical copies or items.
  • Please file the document in quadruplicate.

Synonyms

• Quartet: A set or group of four people or things, often used in music or artistic contexts.
• Tetrad: A group or set of four, used in technical or scientific contexts.
• Foursome: A group of four people, often for a game or activity.

Related Phrases

• Set of quadruplets: The complete group of four siblings.
  • The set of quadruplets all have different personalities.
• To be a quadruplet: To be one of four born from the same pregnancy.
  • He is proud to be a quadruplet.

Related Idioms

(Note: There are no common idioms that use the exact word "quadruplet." Idioms typically use the number "four," such as "on all fours.")

Noun

1. a set of four similar things considered as a unit
2. one of four children born at the same time from the same pregnancy
3. the cardinal number that is the sum of three and one