Dunbar's number is a:

Dunbar's number is the cognitive limit of human relationships that can be maintained by a person at a time.  The number is deemed at 150.

Explanation:

British anthropologist Robin Dunbar came up with the notion of the Dunbars number. According to him, there is a correlation between the brain size of primates and the number of stable relationships they can maintain at a time.

In lay terms, Dunbar explained that this number depicts the number of people a person can freely join at a table in a bar uninvited. Inclusive in this number are also past colleagues and friends that can be reunited and associated with. There are ongoing debates about the accuracy of this notion.

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voracity is the noun corresponding to the adjective voracious, which means (1) eager to consume a great amount of food, or (2) marked by an insatiable appetite. veracity is far more common than the rare voracity, so the latter is sometimes used in place of the former.