noun

• (law) A minor.
  "Thomas Humphrey Doleman died the 30th of August 1712, an infant, intestate and without issue; Lewis the next nephew died the 17th of April 1716, an infant about sixteen years old, having left his mother Mary Webb, ..."
• (countable, chiefly UK, Ireland, Commonwealth) A student in an infant school or the first part of a primary school.
• (obsolete) A noble or aristocratic youth.
  "Retourned home, the royall Infant fell / Into her former fitt [...]."

adj

• (not comparable, chiefly UK, Ireland, 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."
• (figurative, of a river) small, being near its source.
  "Leaving Nantyglo, a small station at an altitude of 1,030 ft. with the platform on the eastern side, the train runs northwards over former G.W.R. metals, with the infant River Ebbw, a little more than a yard wide, on the west."

verb

• (obsolete) 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."