| infraction | (noun) a crime less serious than a felony | Synonyms: infringement, misdemeanor, misdemeanour, violation |
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| infrared | (noun) the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range | Synonyms: infrared frequency |
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| (noun) electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves | Synonyms: infrared emission, infrared light, infrared radiation |
| 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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| infrigidation | (noun) the process of cooling or freezing (e.g., food) for preservative purposes | Synonyms: refrigeration |
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| 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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