| informality | (noun) a manner that does not take forms and ceremonies seriously | - |
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| (noun) freedom from constraint or embarrassment | Synonyms: ease |
| informally | (adverb) without formality | - |
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| (adverb) with the use of colloquial expressions | Synonyms: colloquially, conversationally |
| informant | (noun) a person who supplies information | Synonyms: source |
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| (noun) someone who sees an event and reports what happened | Synonyms: witness, witnesser |
| informatics | (noun) the sciences concerned with gathering, manipulating, storing, retrieving, and classifying recorded information | Synonyms: information processing, information science, IP |
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| information | (noun) (communication theory) a numerical measure of the uncertainty of an outcome | Synonyms: entropy, selective information |
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| (noun) knowledge acquired through study or experience or instruction | - |
| (noun) a message received and understood | Synonyms: info |
| (noun) formal accusation of a crime | - |
| (noun) a collection of facts from which conclusions may be drawn | Synonyms: data |
| informational | (adjective) relating to or having the nature of information | - |
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| informative | (adjective) providing or conveying information | Synonyms: informatory |
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| (adjective) tending to increase knowledge or dissipate ignorance | Synonyms: enlightening, illuminating |
| (adjective) serving to instruct or enlighten or inform | Synonyms: instructive |
| informatively | (adverb) in an informative manner | Synonyms: instructively |
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| informatory | (adjective) providing or conveying information | Synonyms: informative |
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| informed | (adjective) having much knowledge or education | - |
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| informer | (noun) one who reveals confidential information to the police or other authority | Synonyms: betrayer, blabber, rat, squealer |
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| informercial | (noun) a television commercial presented in the form of a short documentary | Synonyms: infomercial |
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| informing | (noun) a speech act that conveys information | Synonyms: making known |
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| (noun) to furnish incriminating evidence to an officer of the law (usually in return for favors) | Synonyms: ratting |
| infotainment | (noun) a film or TV program presenting the facts about a person or event | Synonyms: docudrama, documentary, documentary film |
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| infra | (adverb) (in writing) at a later place | Synonyms: below |
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| infract | (verb) act in disregard of laws, rules, contracts, or promises | Synonyms: breach, break, go against, offend, transgress, violate |
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| infraction | (noun) a crime less serious than a felony | Synonyms: infringement, misdemeanor, misdemeanour, violation |
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| infrahuman | (adjective) belonging to a group below humans in evolutionary development | - |
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| inframaxillary | (adjective) relating to the lower jaw | Synonyms: mandibular |
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| infrangible | (adjective) not capable of being violated or infringed | Synonyms: absolute, inviolable |
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| (adjective) difficult or impossible to break or separate into parts | - |
| infrared | (adjective) having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end | - |
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| (noun) the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range | Synonyms: infrared frequency |
| (noun) electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves | Synonyms: infrared emission, infrared light, infrared radiation |
| infrasonic | (adjective) having frequencies below those of audible sound | - |
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| infrastructure | (noun) the stock of basic facilities and capital equipment needed for the functioning of a country or area | Synonyms: base |
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| (noun) the basic structure or features of a system or organization | Synonyms: substructure |
| infrequency | (noun) noteworthy scarcity | Synonyms: rareness, rarity |
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| infrequent | (adjective) not frequent; not occurring regularly or at short intervals | - |
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| infrequently | (adverb) not many times | - |
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| infrigidation | (noun) the process of cooling or freezing (e.g., food) for preservative purposes | Synonyms: refrigeration |
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| infringe | (verb) advance beyond the usual limit | Synonyms: encroach, impinge |
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| (verb) go against, as of rules and laws | Synonyms: conflict, contravene, run afoul |
| infringement | (noun) a crime less serious than a felony | Synonyms: infraction, misdemeanor, misdemeanour, violation |
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| (noun) an act that disregards an agreement or a right | Synonyms: violation |
| infructescence | (noun) the fruiting stage of the inflorescence | - |
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| infundibulum | (noun) any of various funnel-shaped parts of the body (but especially the hypophyseal stalk) | - |
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| infuriate | (verb) make furious | Synonyms: exasperate, incense |
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| infuriated | (adjective) marked by extreme anger | Synonyms: angered, enraged, furious, maddened |
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| infuriating | (adjective) extremely annoying or displeasing | Synonyms: exasperating, maddening, vexing |
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| infuriation | (noun) a feeling of intense anger and impatience | Synonyms: enragement |
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| infuscate | (verb) darken with a brownish tinge, as of insect wings | - |
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| infuse | (verb) introduce into the body through a vein, for therapeutic purposes | - |
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| (verb) let sit in a liquid to extract a flavor or to cleanse | Synonyms: steep |
| (verb) fill, as with a certain quality | Synonyms: impregnate, instill, tincture |
| (verb) undergo the process of infusion | - |
| (verb) teach and impress by frequent repetitions or admonitions | Synonyms: inculcate, instill |
| infusion | (noun) (medicine) the passive introduction of a substance (a fluid or drug or electrolyte) into a vein or between tissues (as by gravitational force) | - |
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| (noun) the act of infusing or introducing a certain modifying element or quality | - |
| (noun) the process of extracting certain active properties (as a drug from a plant) by steeping or soaking (usually in water) | - |
| (noun) a solution obtained by steeping or soaking a substance (usually in water) | Synonyms: extract |
| infusorian | (noun) any member of the subclass Infusoria | - |
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