from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of or relating to infants or infancy.
  • adjective Displaying or suggesting a lack of maturity; childish: synonym: young.

from The Century Dictionary.

  • Of or belonging to infants or little children; pertaining to or characteristic of infancy or an infant.
  • Of the character of an infant; infant-like.
  • In geology, of a land form, having been subjected to the processes of erosion, in its present relation to base-level, for a very short lime.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Of or pertaining to infancy, or to an infant; similar to, or characteristic of, an infant; childish.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Pertaining to infants.
  • adjective Childish; immature.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective indicating a lack of maturity
  • adjective of or relating to infants or infancy
  • adjective being or befitting or characteristic of an infant


from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English infantil, from Latin īnfantīlis, from īnfāns, īnfant-, infant; see infant.]



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