Try Our Apps


Avoid these words. Seriously.


[lak-tey-shuh n] /lækˈteɪ ʃən/
the secretion or formation of milk.
the period of milk production.
Origin of lactation
1660-70; < Late Latin lactātiōn- (stem of lactātiō) a giving suck. See lactate1, -ion
Related forms
lactational, adjective
lactationally, adverb
hyperlactation, noun
overlactation, noun
superlactation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
Examples from the Web for lactation
Contemporary Examples
Historical Examples
British Dictionary definitions for lactation


the secretion of milk from the mammary glands after parturition
the period during which milk is secreted
Derived Forms
lactational, adjective
lactationally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for lactation

1660s, "process of suckling an infant," from French lactation, from Late Latin lactationem (nominative lactatio) "a suckling," noun of action from past participle stem of lactare "suckle," from lac (genitive lactis) "milk," from PIE root *glakt- (cf. Greek gala, genitive galaktos, "milk"), which, along with *melg-, accounts for words for "milk" in most Indo-European languages (the absence of a common word for it is considered a mystery). Meaning "process of secreting milk from the breasts" first recorded 1857. Middle Irish lacht, Welsh llaeth "milk" are loan words from Latin.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
lactation in Medicine

lactation lac·ta·tion (lāk-tā'shən)

  1. The secretion or formation of milk by the mammary glands.

  2. The period during which the mammary glands secrete milk.

lac·ta'tion·al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
lactation in Science
The secretion or production of milk by the mammary glands in female mammals after giving birth.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Nearby words for lactation

Difficulty index for lactation

Some English speakers likely know this word

Word Value for lactation

Scrabble Words With Friends