Dunbar numbern.

Brit.

/ˈdʌnbɑː ˌnʌmbə/, U.S.

/ˈdənˌbɑr ˌnəmbər/

Forms:

α. 2000s– Dunbar's number.

β. 2000s– Dunbar number.

Origin: From a proper name, combined with an English element. Etymons: proper name Dunbar , number n.

Etymology: In α. forms < the genitive of the name of Robin Dunbar (b. 1947), British anthropologist and evolutionary psychologist + number n. In β. forms < the name of Robin Dunbar + number n.Such a number was first calculated by Dunbar in 1993 ( Behavioral & Brain Sci. 16 682/2).

Cultural Anthropology.

A theoretical maximum size of a stable social group in which all of the members know each other (usually considered to be about 150).Also interpreted as the maximum number of people with whom any individual is able to sustain stable or meaningful social relationships.

ΚΠ

2003 A. Edwards Images Eden v. 108 They could hardly have operated effectively with substantially more or less than Dunbar's number of 150—less would have been inadequate and more would have required a hierarchy of command.

2008 N.Y. Times Mag. 7 Sept. 46/2 Psychological studies have confirmed that human groupings naturally tail off at around 150 people: the ‘Dunbar number’, as it is known.

2011 C. Stringer Origin our Species (2012) v. 114 The Dunbar number in modern humans seems to fall between about 100 and 220 (average 148), and the figure matches quite well with the optimum size of large hunter-gatherer aggregations, tribal villages, Hutterite settlements, small military units and even the average number of people in effective social networks on the web.

2014 Guardian 1 Nov. (Weekend Suppl.) 106/1 To accumulate 1,000 Facebook friends, Dunbar's Number suggests, is to violate a law as old as humanity itself.

This entry has been updated (OED Third Edition, September 2018; most recently modified version published online March 2022).

单词	dunbar number
释义	Dunbar numbern. Brit. /ˈdʌnbɑː ˌnʌmbə/, U.S. /ˈdənˌbɑr ˌnəmbər/ Forms: α. 2000s– Dunbar's number. β. 2000s– Dunbar number. Origin: From a proper name, combined with an English element. Etymons: proper name Dunbar , number n. Etymology: In α. forms < the genitive of the name of Robin Dunbar (b. 1947), British anthropologist and evolutionary psychologist + number n. In β. forms < the name of Robin Dunbar + number n.Such a number was first calculated by Dunbar in 1993 ( Behavioral & Brain Sci. 16 682/2). Cultural Anthropology. A theoretical maximum size of a stable social group in which all of the members know each other (usually considered to be about 150).Also interpreted as the maximum number of people with whom any individual is able to sustain stable or meaningful social relationships. ΚΠ 2003 A. Edwards Images Eden v. 108 They could hardly have operated effectively with substantially more or less than Dunbar's number of 150—less would have been inadequate and more would have required a hierarchy of command. 2008 N.Y. Times Mag. 7 Sept. 46/2 Psychological studies have confirmed that human groupings naturally tail off at around 150 people: the ‘Dunbar number’, as it is known. 2011 C. Stringer Origin our Species (2012) v. 114 The Dunbar number in modern humans seems to fall between about 100 and 220 (average 148), and the figure matches quite well with the optimum size of large hunter-gatherer aggregations, tribal villages, Hutterite settlements, small military units and even the average number of people in effective social networks on the web. 2014 Guardian 1 Nov. (Weekend Suppl.) 106/1 To accumulate 1,000 Facebook friends, Dunbar's Number suggests, is to violate a law as old as humanity itself. This entry has been updated (OED Third Edition, September 2018; most recently modified version published online March 2022). < n.2003
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