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infamy evil or shameful reputation. [3 definitions]
infancy the first months of a child's life; very early childhood. [2 definitions]
infant a child in the first months of life, esp. before he or she can walk. [3 definitions]
infanta the daughter of a Spanish or Portuguese king, or the wife of his son who is not heir to the throne.
infante a son of a Spanish or Portuguese king who is not heir to the throne.
infanticide the murder of an infant. [2 definitions]
infantile like or suitable to an infant, esp. in behavior; babyish or childish. [2 definitions]
infantile paralysis poliomyelitis.
infantilism an abnormal condition of an adult marked by the persistence of immature mental and physical development and behavior, including lack of sexual maturation. [2 definitions]
infantry foot soldiers, or the branch of the military to which they belong.
infantryman a soldier in the infantry; foot soldier.
infarct a localized area of tissue that is dead or dying from obstruction of its blood supply.
infatuate to cause a foolish and irrational passion or attachment in (someone). [2 definitions]
infatuated having a strong and irrational attraction to or passion for someone or something.
infatuation the condition or feeling of being infatuated. [2 definitions]
in favor of in support of. [2 definitions]
infect to contaminate with germs or disease. [4 definitions]
infection the act of infecting or an instance or state of being infected. [4 definitions]
infectious capable of being transmitted by infection. [2 definitions]
infectious hepatitis an abnormal condition of the liver accompanied by inflammation, jaundice, nausea, and vomiting, that may be caused by a viral infection or poison.
infectious mononucleosis a severe viral disease, usu. occurring in children and adolescents, that causes fever, swelling of the lymph nodes, sore throat, and an increase of white cells with a single nucleus in the bloodstream; glandular fever.