To bring (the body or part of it) into contact with a substance that causes illness (a pathogen), so that the pathogen begins to act on the body; (of a pathogen) to come into contact with (a body or body part) and begin to act on it.

infectedverb

simple past and past participle of infect

infectionnoun

The act or process of infecting.

infectiousadj

Caused by an agent that enters the host's body (such as a bacterium, virus, parasite, or prion); often, also, transmitted among hosts via any of various routes (for example, contact, droplet-borne, airborne, waterborne, foodborne, fomite-borne, or bloodborne).

infectiveadj

Able to cause infection; infectious

infectivitynoun

The ability of a pathogen to establish an infection

inferverb

To introduce (something) as a reasoned conclusion; to conclude by reasoning or deduction, as from premises or evidence.

inferencenoun

The act or process of inferring by deduction or induction.

inferentialadj

Of, pertaining to, or derived using inference.

inferioradj

Lower in rank, status, or quality.

inferioritynoun

The quality or state of being inferior.

infernaladj

Of or relating to hell, or the world of the dead; hellish.

infernonoun

A place or situation resembling Hell.

inferredverb

simple past and past participle of infer

inferringnoun

The act of one who infers something; the drawing of an inference.

infertileadj

Not fertile.

infertilitynoun

The condition of being infertile; of having poor fertility.

infestverb

To inhabit a place in unpleasantly large numbers; to plague, harass.

infestationnoun

The presence of a large number of pest organisms in an area or field, on the surface of a host or anything that might contact a host, or in the soil.

infideladj

Rejecting a specific religion.

infidelitynoun

Unfaithfulness in a marriage or an intimate (sexual or romantic) relationship: practice or instance of having a sexual or romantic affair with someone other than one's spouse, without the consent of the spouse.

infieldnoun

The area inside a racetrack or running track.

infieldernoun

A player who plays in the infield, which is the inner portion of the field.

infightingnoun

Fighting or quarreling among the members of a single group or side.

infillverb

To fill in a space, hole or gap.

Spelling & Dictionary Insight

The English alphabetical index for the letter I contains 17,902 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 359 pages, and you are currently viewing page 20. Every row above is a dictionary-backed entry with a canonical slug, and each links through to a full definition page with pronunciation, senses, etymology, and related-word data where available.

On this page 50 of 50 entries carry a part-of-speech tag and 50 carry at least one stored definition. Coverage varies across letters because Wiktionary volunteers build entries at different speeds for different parts of the alphabet, letters with common starting sounds (S, C, T, P) usually have the densest coverage, while less frequent starters (X, Q, Z) tend to have shorter but more specialised lists. PlainSpell surfaces whatever data is present and links back to the source when a definition is not yet recorded.

For readers using this index as a spelling reference, the guarantee is that every form you see on the list is a documented English headword, not a guess, not a derived inflection lacking a lemma row. If a word you expected to find is absent from the "I" list, it usually means the form exists only as an inflection of another lemma (e.g. a past participle stored under the infinitive) or the entry has not yet been imported from Wiktionary. Use the search bar or the misspelling lookup to resolve these cases.