[ 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 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for lactation

British Dictionary definitions for lactation


/ (lækˈteɪʃən) /


the secretion of milk from the mammary glands after parturition
the period during which milk is secreted

Derived Forms

lactational, adjectivelactationally, 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

Medicine definitions for lactation


[ lăk-tāshən ]


The secretion or formation of milk by the mammary glands.
The period during which the mammary glands secrete milk.

Related forms

lac•tation•al adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for lactation


[ lăk-tāshən ]

The secretion or production of milk by the mammary glands in female mammals after giving birth.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.