| IR | (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance |
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| IR | (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus |
| IR | the apparent enlargement of a bright object when viewed against a dark background |
| IR | (physiology) the spread of sensory neural impulses in the cortex |
| IR | a column of light (as from a beacon) |
| IR | the condition of being exposed to radiation |
| IR | not consistent with or using reason |
| IR | (math) real but not expressible as the quotient of two integers |
| IR | extreme prejudice |
| IR | a strong spontaneous and irrational motivation |
| IR | a motivation that is inconsistent with reason or logic |
| IR | a real number that cannot be expressed as a rational number |