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lactation (n.)

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 "to suckle," from lac (genitive lactis) "milk" (from PIE root *g(a)lag- "milk"). Meaning "process of secreting milk from the breasts" first recorded 1857. Related: Lactational.

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Definitions of lactation from WordNet

lactation (n.)
the period following birth during which milk is secreted;
lactation normally continues until weaning
lactation (n.)
the production and secretion of milk by the mammary glands;
lactation (n.)
feeding an infant by giving suck at the breast;
Synonyms: suckling
From wordnet.princeton.edu