triplet

n.

1. A group or set of three of one kind.
2. One of three children born at one birth.
3. A group of three lines of verse.
4. Music. A group of three notes having the time value of two notes of the same kind. Also called tercet.
5. Physics. A multiplet with three components.
6. Genetics. A unit of three successive nucleotides in a molecule of DNA or RNA that codes for a specific amino acid; a codon or anticodon.

[TRIPL(E) + (DOUBL)ET.]

An atomic state in which two spin angular momenta of electrons combine together to give a total nonzero spin. A triplet state usually has a lower energy than a singlet state because of the effect of correlations of spin on the Coulomb interactions between electrons (as in Hund's rules). This can lead to substantial energy differences between triplet and singlet states.

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A group of three notes to be performed in the time of two of the same kind or in the time of any number of another kind. They are indicated by a figure 3, usually under a slur; the same notation may be used to signify any triple-rhythm figure (such as a two-beat note followed by a one-beat note).

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triplet, a sequence of three verse lines sharing the same rhyme, sometimes appearing as a variation among the heroic couplets of Dryden and some 18th‐century poets: or any group or stanza of three lines. Triplets occurring among heroic couplets are sometimes indicated by a brace, as in Pope's Essay on Criticism (1711):

Musick resembles Poetry, in each
Are nameless Graces which no Methods teach,
And which a Master‐Hand alone can reach.

The three‐line units used in terza rima and those composing the sestet of an Italian sonnet are more often referred to as tercets.

1. one of three offspring produced at one birth.
2. a combination of three objects or entities acting together, as three lenses or three nucleotides. See also codon.

IN BRIEF: A set of three similar things considered as a unit.

The poet wrote verses in couplets and triplets.

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Dansk (Danish)
n. - trilling, trio, trefold

Nederlands (Dutch)
drieling

Français (French)
n. - triplé, (Mus) triolet, (Littérat) tercet

Deutsch (German)
n. - Drilling

Ελληνική (Greek)
n. - τρίδυμο, (προσωδ.) τρίστιχο

Italiano (Italian)
tripletta

Português (Portuguese)
n. - trinca (f), trio (m), terceto (grupo de três versos) (m), trigêmeo (m)

Русский (Russian)
тройка, тройняшка, (муз.) триоль

Español (Spanish)
n. - trío, trillizo, tresillo, terceto

Svenska (Swedish)
n. - trilling, triplett, tretal, trio

中文（简体）(Chinese (Simplified))
三个一组, 三份, 三个一幅

中文（繁體）(Chinese (Traditional))
n. - 三個一組, 三份, 三個一幅

한국어 (Korean)
n. - 셋으로 된 한 벌, 3행 연구

日本語 (Japanese)
n. - 三つ子の一人, 三つ子, 三連符, 三つ組, 三行連句, 三つ揃い

العربيه (Arabic)
‏(الاسم) وحدة من ثلاث أبيات من الشعر, ألثلاثيه‏

עברית (Hebrew)
n. - ‮שלישייה‬

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triplet strollers	Peg Perego Triplet Strollers