1 (usually quadruplets) Each of four children born at one birth.
- Commotion over multiple births - quadruplets, quintuplets, sextuplets - isn't new.
- The birth of both boy and girl quadruplets has been an extremely rare occurrence in Shanghai in the past 30 years.
- About 500 sets of quadruplets are born each year in the US, according to the National Centre for Health Statistics.
Late 18th century: from quadruple, on the pattern of triplet.
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