Select the INCORRECTLY spelt word.

discrimnation

The incorrectly spelled word is "discrimnation"

Explanation:

1. Hallucination: This word is correctly spelled. It refers to a sensory perception or experience that appears real but is not based on external stimuli.

2. Illumination: This word is correctly spelled. It means the act of lighting up or providing light, or it can refer to intellectual or spiritual enlightenment.

3. Intimation: This word is correctly spelled. It means a subtle or indirect suggestion or hint.

4. Discrimnation: This is the misspelled form of the word "discrimination," which refers to the unjust or prejudicial treatment of different categories of people.