regression

noun

re·​gres·​sion ri-ˈgre-shən 

1

: the act or an instance of regressing

2

: a trend or shift toward a lower or less perfect state: such as

a

: progressive decline of a manifestation of disease

b(1)

: gradual loss of differentiation and function by a body part especially as a physiological change accompanying aging

(2)

: gradual loss of memories and acquired skills

c

: reversion to an earlier mental or behavioral level

d

: a functional relationship between two or more correlated variables that is often empirically determined from data and is used especially to predict values of one variable when given values of the others

the regression of y on x is linear

specifically : a function that yields the mean value of a random variable under the condition that one or more independent variables have specified values

3

: retrograde motion

Synonyms

• retrogression
• reversion

Examples of regression in a Sentence

the regression to really childish behavior that boys often undergo when put in large groups

Recent Examples on the Web

Beyond injuries, the Cubs also seem keenly aware that there could be regression coming for their pitchers. —Sahadev Sharma, The Athletic, 19 Dec. 2024

In the last three games, McCormick showed some positive regression, topping off last week's 28-13 loss to the Tampa Bay Buccaneers with his best performance of 89 total yards including a pair of catches and 15 carries. —Thomas G. Moukawsher, Newsweek, 17 Dec. 2024

We’re pulled, in Headland’s telling, by a weird mix of mythological pressure, Darwinian logic, residual altruism, childhood regression and (most importantly) raw personal need. —Chris Jones, New York Daily News, 13 Dec. 2024

However, the past two games have been a regression, with the Patriots losing in dominant fashion to the New York Jets, 24-3, before losing to the San Francisco 49ers, 30-13. —Dj Siddiqi, Forbes, 3 Oct. 2024

Word History

First Known Use

1583, in the meaning defined at sense 1

Phrases Containing regression

• linear regression
• multiple regression

Kids Definition

regression

noun

re·​gres·​sion ri-ˈgresh-ən 

: an act or the fact of regressing

Medical Definition

regression

noun

re·​gres·​sion ri-ˈgresh-ən 

: a trend or shift toward a lower, less severe, or less perfect state: as

a

: progressive decline (as in size or severity) of a manifestation of disease

tumor regression following radiation

b(1)

: a gradual loss of differentiation and function by a body part especially as a physiological change accompanying aging

menopausal regression of the ovaries

(2)

: gradual loss (as in old age) of memories and acquired skills

c

: reversion to an earlier mental or behavioral level or to an earlier stage of psychosexual development in response to organismic stress or to suggestion

a protective regression towards childhood

—Havelock Ellis