| irradiation | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, radiation, radiation therapy, radiotherapy |
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| (noun) the apparent enlargement of a bright object when viewed against a dark background | - |
| (noun) (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus | - |
| (noun) (physiology) the spread of sensory neural impulses in the cortex | - |
| (noun) a column of light (as from a beacon) | Synonyms: beam, beam of light, light beam, ray, ray of light, shaft, shaft of light |
| (noun) the condition of being exposed to radiation | - |
| irrational | (noun) a real number that cannot be expressed as a rational number | Synonyms: irrational number |
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| irrationality | (noun) the state of being irrational; lacking powers of understanding | Synonyms: unreason |
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| irreality | (noun) the state of being insubstantial or imaginary; not existing objectively or in fact | Synonyms: unreality |
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| irredenta | (noun) a region that is related ethnically or historically to one country but is controlled politically by another | Synonyms: irridenta |
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| irredentism | (noun) the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related | Synonyms: irridentism |
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| irredentist | (noun) an advocate of irredentism | Synonyms: irridentist |
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| irregular | (noun) merchandise that has imperfections; usually sold at a reduced price without the brand name | Synonyms: second |
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| (noun) a member of an irregular armed force that fights a stronger force by sabotage and harassment | Synonyms: guerilla, guerrilla, insurgent |
| irregularity | (noun) behavior that breaches the rule or etiquette or custom or morality | Synonyms: abnormality |
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| (noun) not characterized by a fixed principle or rate; at irregular intervals | Synonyms: unregularity |
| (noun) an irregular asymmetry in shape; an irregular spatial pattern | Synonyms: geometrical irregularity |
| (noun) irregular and infrequent or difficult evacuation of the bowels; can be a symptom of intestinal obstruction or diverticulitis | Synonyms: constipation |
| irrelevance | (noun) the lack of a relation of something to the matter at hand | Synonyms: irrelevancy |
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| irrelevancy | (noun) the lack of a relation of something to the matter at hand | Synonyms: irrelevance |
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| irreligion | (noun) the quality of not being devout | Synonyms: irreligiousness |
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| irreligionist | (noun) someone who is indifferent or hostile to religion | - |
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| irreligiousness | (noun) the quality of not being devout | Synonyms: irreligion |
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| irremovability | (noun) the quality or state of not being removable. | - |
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| irreplaceableness | (noun) the quality of being irreplaceable | - |
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| irrepressibility | (noun) irrepressible liveliness and good spirit | Synonyms: buoyancy |
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| irreproducibility | (noun) the quality of being unreproducible | - |
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| irresistibility | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibleness |
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| irresistibleness | (noun) the quality of being overpowering and impossible to resist | Synonyms: irresistibility |
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| irresoluteness | (noun) the trait of being irresolute; lacking firmness of purpose | Synonyms: irresolution |
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| irresolution | (noun) the trait of being irresolute; lacking firmness of purpose | Synonyms: irresoluteness |
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| (noun) doubt concerning two or more possible alternatives or courses of action | Synonyms: indecision, indecisiveness |
| irresponsibility | (noun) a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions | Synonyms: irresponsibleness |
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| irresponsibleness | (noun) a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions | Synonyms: irresponsibility |
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| irreverence | (noun) a disrespectful act | Synonyms: violation |
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| (noun) an irreverent mental attitude | - |
| irreversibility | (noun) the quality of being irreversible (once done it cannot be changed) | - |
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| irrevocability | (noun) The state or condition of being impossible to retract or reverse; finality. | - |
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| irridenta | (noun) a region that is related ethnically or historically to one country but is controlled politically by another | Synonyms: irredenta |
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| irridentism | (noun) the doctrine that irredenta should be controlled by the country to which they are ethnically or historically related | Synonyms: irredentism |
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| irridentist | (noun) an advocate of irredentism | Synonyms: irredentist |
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| irrigation | (noun) supplying dry land with water by means of ditches etc | - |
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| (noun) (medicine) cleaning a wound or body organ by flushing or washing out with water or a medicated solution | - |
| irritability | (noun) a disposition to exhibit uncontrolled anger | Synonyms: biliousness, peevishness, pettishness, snappishness, surliness, temper |
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| (noun) excessive sensitivity of an organ or body part | Synonyms: excitability |
| (noun) an irritable petulant feeling | Synonyms: choler, crossness, fretfulness, fussiness, peevishness, petulance |
| irritant | (noun) something that causes irritation and annoyance | Synonyms: thorn |
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| irritation | (noun) unfriendly behavior that causes anger or resentment | Synonyms: aggravation, provocation |
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| (noun) the act of troubling or annoying someone | Synonyms: annoyance, annoying, vexation |
| (noun) an uncomfortable feeling of mental painfulness or distress | Synonyms: discomfort, soreness |
| (noun) a sudden outburst of anger | Synonyms: pique, temper |
| (noun) the psychological state of being irritated or annoyed | Synonyms: annoyance, botheration, vexation |
| (noun) the neural or electrical arousal of an organ or muscle or gland | Synonyms: excitation, innervation |
| (noun) (pathology) abnormal sensitivity to stimulation | - |
| irruption | (noun) a sudden violent entrance; a bursting in | - |
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| (noun) a sudden violent spontaneous occurrence (usually of some undesirable condition) | Synonyms: eruption, outbreak |
| (noun) a sudden sharp increase in the relative numbers of a population | - |