| Noun | 1. | lactation - the period following birth during which milk is secreted; "lactation normally continues until weaning" period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period" |
| 2. | lactation - the production and secretion of milk by the mammary glands bodily function, bodily process, body process, activity - an organic process that takes place in the body; "respiratory activity" | |
| 3. | lactation - feeding an infant by giving suck at the breast alimentation, feeding - the act of supplying food and nourishment |