lactation

noun

lac·​ta·​tion lak-ˈtā-shən 

plural lactations

1

: the production and secretion of milk by the mammary glands

… there may be overproduction of prolactin, the breast milk hormone. A sign of that might be abnormal lactation.

—Paul G. Donohue

When a doe kids and begins lactation, she must draw on the calcium stored in her bones to furnish enough blood calcium for milk production.

—David B. Weems

… lactation rooms where mothers can express milk for baby.

—Shawn Tully

… the infants of mothers given the names of lactation support groups or individuals instead are more likely to be fully breast-feeding at four months.

—Barbara Quick

2

: one complete period of lactation extending from about the time of birthing to weaning

… cows fed 1.1 percent bicarb in the total ration produced an average 17,587 lbs. of milk per lactation …

—Eastern Milk Producer

lactational

lak-ˈtā-sh(ə-)nəl 

adjective

lactational mastitis

Examples of lactation in a Sentence

Recent Examples on the Web

Ask the doctor or the lactation consultant questions. —Essence, 29 Aug. 2025

Partners, coworkers, and lactation consultants can all help troubleshoot challenges, says Tribus. —Sarah Scott, Parents, 28 Aug. 2025

The Pacify app makes connecting with doulas, lactation consultants, and resources more convenient. —Connie Etemadi, USA Today, 27 Aug. 2025

Care Ring wants more mothers to breast feed, Montgomery said, so lactation consulting is one significant aspect included in the new program. —Charlotte Observer, 15 Aug. 2025

Word History

First Known Use

circa 1837, in the meaning defined at sense 1

Rhymes for lactation

• ablation
• bination
• carnation
• cassation
• castration
• causation
• centration
• cessation
• cetacean
• chelation
• citation
• collation

Medical Definition

lactation

noun

lac·​ta·​tion lak-ˈtā-shən 

1

: the secretion and yielding of milk by the mammary gland

2

: one complete period of lactation extending from about the time of parturition to weaning

lactational

-shən-ᵊl 

adjective

lactationally

-ē 

adverb