triplet

American  

[trip-lit] / ˈtrɪp lɪt /

noun

• triplets
  plural

1. one of three children or offspring born at the same birth.

2. triplets, three offspring born at one birth.

3. any group or combination of three.

4. Prosody. three successive verses or lines, especially when rhyming and of the same length; a stanza of three lines.

5. Also called tercet. Music. a group of three notes to be performed in the time of two ordinary notes of the same kind.

6. an assembled imitation gem with three parts, the center one giving the color, the top and bottom, sometimes genuine, supplying the wearing qualities.

7. Genetics. a sequence of three nucleotides; a codon in messenger RNA and an anticodon in transfer RNA.

8. Optics. a compound lens in which three lenses are combined.

9. triplets, (in some card games) three cards of the same denomination.

---

triplet British  

/ ˈtrɪplɪt /

noun

1. a group or set of three similar things

2. one of three offspring born at one birth

3. music a group of three notes played in a time value of two, four, etc

4. chem a state of a molecule or free radical in which there are two unpaired electrons

---

Other Word Forms

Noun Inflected Forms

• triplets
  plural

---

Etymology

Origin of triplet

First recorded in 1650–60; triple + -et

---

Explanation

When a mammal gives birth to three offspring at the same time, each is a triplet. If you're a triplet, you've got at least two siblings right from the moment you're born. While some triplets are identical (three fetuses from a single egg), it's more likely for triplets to be fraternal (from three separate eggs). In humans, twins are more common than triplets, and multiple births of more than three are even more rare. Triplet can also mean another group of three, like three lines of poetry or three notes of music.

Example Sentences

See Examples For:

triplet triplets

It was only after two triplet brothers died in June 2016 that Letby was taken off nursing duty.

From BBC ● Sep. 12, 2026

In 2008, one sister triplet was miscarried, while two of her sisters lived "for a significant amount of time", but NUH registered all three babies as miscarriages.

From BBC ● Jul. 18, 2026

When two triplet states encounter one another, they combine and release their energy as a single UV photon.

From Science Daily ● Jun. 26, 2026

In 2012, Nobuo Kimizuka, now Professor Emeritus at Kyushu University's Research Center for Negative Emissions Technologies, began exploring photon upconversion through triplet energy migration in self-assembled molecular systems.

From Science Daily ● Jun. 26, 2026

Erlan was a triplet too, but I could always tell Erlan apart from Karim and Erik.

From Absolutely Almost by Lisa Graff

Very rare triplets in Los Angeles came close to breaking a world record.

From MarketWatch ● Sep. 1, 2026

When Marco Bernal realized his wife was pregnant with triplets, the man had to sit down on the living room floor.

From Los Angeles Times ● Aug. 31, 2026

In Canterbury, Kent, triplets Scarlett, Grace and Tabby Taylor said they were ecstatic for themselves and each other after getting into their first choice universities.

From BBC ● Aug. 13, 2026

Fertility organizations have urged clinics in recent years to limit surrogate pregnancies to one embryo, citing higher risks of carrying twins or triplets.

From The Wall Street Journal ● Jul. 31, 2026

How would we make our teams even with triplets?

From "Zara’s Rules for Record-Breaking Fun" by Hena Khan

Random Word

Spin the wheel and learn a new word!

---

Related Words

• threesome
• trilogy
• triumvirate

---