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.

Definitions of triplet
  1. noun
    one of three offspring born at the same time from the same pregnancy
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    type of:
    sib, sibling
    a person's brother or sister
  2. noun
    a set of three similar things considered as a unit
    synonyms: triad, trio, triple
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    the triad of divinities of later Hinduism
    a set of three literary or dramatic works related in subject or theme
    trigon, triplicity
    (astrology) one of four groups of the zodiac where each group consists of three signs separated from each other by 120 degrees
    type of:
    a group of things of the same kind that belong together and are so used
  3. noun
    a rhythmic group of three lines of verse
    synonyms: tercet
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    type of:
    a fixed number of lines of verse forming a unit of a poem
  4. noun
    the cardinal number that is the sum of one and one and one
    synonyms: 3, III, deuce-ace, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trine, trinity, trio, troika
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    type of:
    digit, figure
    one of the elements that collectively form a system of numeration
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