lactivismEnglishOxford Dictionary of Englishlactivism /ˈlaktɪvɪz(ə)m / ▸ noun [mass noun] strong advocacy of breastfeeding (sometimes used with negative connotation, suggesting an uncompromising approach): the rally is only the most visible example of a recent wave of lactivism. – ORIGIN early 21st century: blend of lactation and activism, on the model of lactivist.