| 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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