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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
lac·ta·tion    Audio Help   [lak-tey-shuhn] Pronunciation Key
–noun
1.the secretion or formation of milk.
2.the period of milk production.

[Origin: 1660–70; < LL lactātiōn- (s. of lactātiō) a giving suck. See lactate1, -ion]

lac·ta·tion·al, adjective
lac·ta·tion·al·ly, adverb
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
Encyclopædia Britannica, Inc.
lactation

To learn more about lactation visit Britannica.com

© 2008 Encyclopædia Britannica, Inc.
American Heritage Dictionary - Cite This Source - Share This
lac·ta·tion    Audio Help   (lāk-tā'shən)  Pronunciation Key 
n.  
  1. Secretion or formation of milk by the mammary glands.
  2. The period during which the mammary glands secrete milk.

lac·ta'tion·al adj.
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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Online Etymology Dictionary - Cite This Source - Share This
lactation 
1668, "process of suckling an infant," from Fr. lactation, from L. lactationem (nom. lactatio) "a suckling," from L. lactatus, pp. of lactare "suckle," from lac (gen. lactis) "milk," from PIE base *glact- (cf. Gk. gala, gen. galaktos "milk"). Meaning "process of secreting milk from the breasts" first recorded 1857; lactate (v.) in this sense is a back-formation from 1889. Lactic acid is from 1790; so called because it was obtained from sour milk. M.Ir. lacht, Welsh llaeth "milk" are loan words from Latin.

Online Etymology Dictionary, © 2001 Douglas Harper
WordNet - Cite This Source - Share This
lactation

noun
1. the period following birth during which milk is secreted; "lactation normally continues until weaning" 
2. the production and secretion of milk by the mammary glands 
3. feeding an infant by giving suck at the breast [syn: suckling

WordNet® 3.0, © 2006 by Princeton University.
The American Heritage Science Dictionary - Cite This Source - Share This
lactation    Audio Help   (lāk-tā'shən)  Pronunciation Key 
The secretion or production of milk by the mammary glands in female mammals after giving birth.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Lactation

Lac*ta"tion\, n. A giving suck; the secretion and yielding of milk by the mammary gland.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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