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 of regression

• 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

There was bound to be some regression, and shoved into a closer’s role after the injury to Estevez, there was likely to be some exposure, too. —Sam McDowell, Kansas City Star, 27 May 2026

Organizations report 40-60% reductions in test maintenance, capacity that redirects into regression coverage that scales with the product. —Asad Khan, Forbes.com, 26 May 2026

Underlying metrics suggest there is room for a positive regression, which Burrows must author to feel more comfortable about his position. —Chandler Rome, New York Times, 25 May 2026

That plus a slight regression in one-score games means this fall’s record may well not look as gaudy as last year’s. —Parker Gabriel, Denver Post, 15 May 2026

Word History

First Known Use

1583, in the meaning defined at sense 1

Phrases Containing regression

• linear regression
• multiple regression

Rhymes for regression

• accession
• aggression
• compression
• concession
• confession
• depression
• digression
• discretion
• expression
• impression
• obsession
• oppression

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