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informal not formal or ceremonious; casual. [3 definitions]
informality the condition of being informal; lack of formality; casualness. [2 definitions]
informant one who gives information.
informatics a branch of science dealing with the storage and processing of data.
information knowledge or facts that come from investigation, observation, or study. [4 definitions]
informative providing information, or adding to one's knowledge or understanding.
informed having, showing, or using information. [2 definitions]
informer one who secretly provides incriminating information about another, esp. for reward.
infra- beneath; below.
infraction an act or instance of breaking or violating, usu. a rule or law; violation or breach.
infra dig (informal) beneath one's dignity.
infrangible impossible to break; unbreakable. [2 definitions]
infrared the invisible electromagnetic radiation next to and longer in wavelength than those of the visible red end of the spectrum. [2 definitions]
infrasonic of, concerning, or denoting sound waves below the audible frequencies.
infrastructure the basic facilities and equipment, esp. of a technological nature, that are necessary for a system or organization to function.
infrequent happening seldom or at long intervals. [3 definitions]
infringe to cross established limits; encroach; trespass (usu. fol. by "on" or "upon"). [2 definitions]
infringement a violation or breaking, as of a law, rule, or contract. [2 definitions]
in front of directly ahead of in place or position.
in full in the complete or required amount.
in full swing at the point of greatest intensity, activity, or momentum.