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Longman Dictionary of Contemporary English
▪ Third, that the economic opportunities available to large and small cohorts of births are quite different.
▪ Members of larger cohorts experience fiercer competition throughout their lives for places in schools, university, employment, and promotion.
▪ The baby bulge birth cohorts have been of an age to have children for some time.
▪ The completed family size is also shown in figure 4.1 for real birth cohorts of women.
▪ For women, a pattern of gradual increase was seen by birth cohort in all age groups.
▪ A cohort study of gastric cancer incidence among cimetidine users previously published is extended with additional three years of observation.
▪ Long-term cohort studies show declines beginning in 1982 and continuing steadily through the late 19805.
▪ Design - Non-randomised cohort study with follow up of subjects for up to 23 years.
▪ Another cohort study has found that pill users tend to be slightly lighter than non-users.
▪ In Britain two examples of cohort studies provide descriptive accounts of patterns of infant care in urban communities.
▪ Design - Prospective cohort study of all women who had entered a donor insemination programme.
▪ A cohort study of the risk of cervical intraepithelial neoplasia grade 2 or 3 in relation to papillomavirus infection.
▪ In a prospective cohort study 141 consecutive patients were admitted to hospital with community-acquired pneumonia.
▪ "Baby boomers" are the largest cohort of Americans living today.
▪ Hawk and his cohorts cheated Jack out of a fortune.
▪ By 1984, 43. 7 percent of the New York cohort was infected.
▪ Figures for 1984 show 67. 4 percent of the cohort infected.
▪ It hit 58 percent in a gay cohort in Denver by 1985, and 58 percent in Seattle in 1986.
▪ It is highly probable that many of those in the initial cohort of patients would have died.
▪ Our findings are based on a cohort of women seeking insemination treatment because their partners had a fertility problem.
▪ The 74 million Baby-Boom cohort dwarfs the 40 million Generation Xers.
▪ The overall in-hospital mortality of 15.6% of this cohort was similar to short-term mortality of similar cohorts in previous studies.
The Collaborative International Dictionary

Series \Se"ries\, n. [L. series, fr. serere, sertum, to join or bind together; cf. Gr. ??? to fasten, Skr. sarit thread. Cf. Assert, Desert a solitude, Exert, Insert, Seraglio.]

  1. A number of things or events standing or succeeding in order, and connected by a like relation; sequence; order; course; a succession of things; as, a continuous series of calamitous events.

    During some years his life a series of triumphs.

  2. (Biol.) Any comprehensive group of animals or plants including several subordinate related groups.

    Note: Sometimes a series includes several classes; sometimes only orders or families; in other cases only species.

  3. (Bot.) In Engler's system of plant classification, a group of families showing certain structural or morphological relationships. It corresponds to the cohort of some writers, and to the order of many modern systematists.

  4. (Math.) An indefinite number of terms succeeding one another, each of which is derived from one or more of the preceding by a fixed law, called the law of the series; as, an arithmetical series; a geometrical series.

  5. (Elec.) A mode of arranging the separate parts of a circuit by connecting them successively end to end to form a single path for the current; -- opposed to parallel. The parts so arranged are said to be

    in series.

  6. (Com.) A parcel of rough diamonds of assorted qualities.

Douglas Harper's Etymology Dictionary

early 15c., "company of soldiers," from Middle French cohorte (14c.) and directly from Latin cohortem (nominative cohors) "enclosure," meaning extended to "infantry company" in Roman army (a tenth part of a legion) through notion of "enclosed group, retinue," from com- "with" (see co-) + root akin to hortus "garden," from PIE *ghr-ti-, from root *gher- (1) "to grasp, enclose" (see yard (n.1)). Sense of "accomplice" is first recorded 1952, American English, from meaning "group united in common cause" (1719).


n. 1 A group of people supporting the same thing or person. 2 (context statistics English) A demographic grouping of people, especially those in a defined age group, or having a common characteristic. 3 (context military history English) Any division of a Roman legion, normally of about 500 men. 4 An accomplice; abettor; associate. 5 Any band or body of warriors. 6 (context taxonomy English) A natural group of orders of organisms, less comprehensive than a class. 7 A colleague.

  1. n. a company of companions or supporters

  2. a band of warriors (originally a unit of a Roman Legion)

  3. a group people having approximately the same age [syn: age group, age bracket]

Cohort (military unit)

A cohort (from the Latin cohors, plural cohortes) was the basic tactical unit of a Roman legion, which replaced the manipular system following the reforms traditionally attributed to Gaius Marius in 107 BC.

Cohort (educational group)

A cohort is a group of students who work through a curriculum together to achieve the same academic degree together. Cohortians are the individual members of such a group.

Cohorts have become popular in online education as a way to address the lack of traditional social interaction that is common in on-site education.

Cohort (statistics)

In statistics and demography, a cohort is a group of subjects who have shared a particular event together during a particular time span (e.g., people born in Europe between 1918 and 1939; survivors of an aircrash; truck drivers who smoked between age 30 and 40). Cohorts may be tracked over extended periods in a cohort study. The cohort can be modified by censoring, i.e. excluding certain individuals from statistical calculations relating to time periods (e.g., after death) when their data would contaminate the conclusions.

The term cohort can also be used where membership of a group is defined by some factor other than a time-based one: for example, where a study covers workers in many buildings, a cohort might consist of the people who work in a given building.

Demography often contrasts cohort perspectives and period perspectives. For instance, the total cohort fertility rate is an index of the average completed family size for cohorts of women, but since it can only be known for women who have finished child-bearing, it cannot be measured for currently fertile women. It can be calculated as the sum of the cohort's age-specific fertility rates that obtain as it ages through time. In contrast, the total period fertility rate uses current age-specific fertility rates to calculate the completed family size for a notional woman were she to experience these fertility rates through her life.


Cohort may refer to:

  • Cohorts, partners in an activity
  • Cohort (biology), in biology, one of the taxonomic ranks
  • Cohort (educational group), a group of students working together through the same academic curriculum
  • Cohort (Roman military unit), the basic tactical unit of a Roman legion
  • Cohort (statistics), a group of subjects with a common defining characteristic—typically age group
  • Cohort study, a form of longitudinal study used in medicine and social science
  • Cohort Studios, a video game development company
  • Generational cohort (demographics), an aggregation of individuals who experience the same event within the same time interval

Usage examples of "cohort".

Roman people, three cohorts only were stationed in the capital, whilst the remainder was dispersed in the adjacent towns of Italy.

Third Century of the Tenth Cohort, Gnaeus, Clodius Afer, hunching along the rampart.

Beyond the agora, Achamian saw a cohort of birds wheeling above the great domes of the Temple Xothei, whose silhouette loomed above the tenements hedging the north end of the market.

Instead of centuries, my fellow wanderers had come to command cohorts, sturdy and strong, armed with spear, bow and sword, protected by shields of stout wood and hide, their bodies covered by thickly padded cloth armor, a good substitute for metal when used only against atlatl darts.

Ozman had ridden out with the last cohort committed, and was grinning ear to ear, his byrnie splashed with blood not his own.

The beauty and, peace of the Carag Huim and the dry, clear air were healing for my lungs if not my spirit, and they enabled me to face Alfrigg and his cohorts with equanimity.

Most of the boys were already stripping armor, and the general ordered a cohort to go and finish off the dregs, you know.

Willard Farger, who was a political cohort of the present administration, had said a lot of things and probably had access to the notes compromising CURE.

The cohorts of the Third Augusta picked themselves up behind him and rushed forward as well, though their hobnailed sandals slipped and skidded on the blood and bodies of the dead men.

It seemed clear that McInturff and his egg-hunting cohorts would either hang me from a willow tree or paddle me out to sea and toss me overboard to the archaic fishes or ichthyosaurs that yet remained.

This line of reasoning proved to be less than persuasive to my cohorts, although they did laugh a good bit on the assumption that I, as jackanapes, was trying to provide some levity.

With a last look at Jenits, she left the tent and headed for the area assigned to her cohort.

And I still wished I could have just done round sleeves like Harani or Pel or any number of other scoili in my cohort had, instead of having to waste six pins on the sleeves and leave only one for the rest of it.

She abandoned her watch on the bard and his halfling cohort while the pair was still digging through the piles of rubble.

Le Plongeon and his cohorts had been pushingthe idea that the brilliant, advanced citizens of Atlantis seeded the ancient civilizations of both hemispheres before their country sank under the sea.