The musical meaning "three notes played in the time of two" is from 1801. also from1650s Entries linking totriplet couplet(n.) 1570s, in poetry, "two lines in succession, forming a pair and generally rhyming with one another," from Frenchcouplet(mid-14c.), a diminutive ofcouple(seecoup...
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.Tripletcan also mean another group of three, like three lines of poetry or three notes of music. ...