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1. Describes the secretion of milk from the mammary glands and the period of time that a mother lactates to feed her young. The process occurs in all female mammals, although it predates mammals. In humans the process of feeding milk is called breastfeeding or nursing. (

2. The period of the secretion of milk. (

3. The secretion of milk by the mammary glands. (Google Dictionary)

4. The suckling of young. (Google Dictionary)

Word origin: 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.”

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