infant /ˈɪn.fənt/noun 4adjective 2verb 1forms 3phrases 1 noun4 •A very young human being, from birth to somewhere between six months and two years of age after birth, needing almost constant care and attention. •(UK, Commonwealth) A student in an infant school or the first part of a primary school. •A minor. •(no longer used) A noble or aristocratic youth.Retourned home, the royall Infant fell / Into her former fitt [...]. — 1590 adjective2 •(UK, Commonwealth) Of or pertaining to the earlier half of primary school education.Primary schooling in Ireland comprises two Infant years, which are equivalent to pre-school in other countries , and six grades or classes. — 2019 •(figurative) small, being near its source. verb1 •(no longer used) To bear or bring forth (a child); to produce, in general.This worthy motto, "No bishop, no king," is […] infanted out of the same fears. — 1641 formsinfanted · infanting · infants Phrases with infant floppy infant syndromeHypotonia.