Antonym: reality. Similar words: allusion, illusion, exclusion, preclusion, conclusion, in conclusion, disillusion, draw a conclusion. Meaning: [dɪ'luːʒn] 
n. 1. (psychology) an erroneous belief that is held in the face of evidence to the contrary 2. a mistaken or unfounded opinion or idea 3. the act of deluding; deception by creating illusory ideas.
n. 1. (psychology) an erroneous belief that is held in the face of evidence to the contrary 2. a mistaken or unfounded opinion or idea 3. the act of deluding; deception by creating illusory ideas. 
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1. His arguments sound convincing but they're based on delusion.
2. I was under the delusion that he intended to marry me.
3. He is under the delusion that he is Napoleon.
4. Love can be nothing but a delusion.
5. Your hopes of promotion are a mere delusion.
6. This was not optimism, it was delusion.
7. He seemed to be under the delusion that he would make his fortune within a few years.
8. He labours under the delusion that he's a fine actor.
9. He is under the delusion that I am going to cheat him.
10. The Rabari suffered no such delusion.
11. The Foundation has fostered this delusion assiduously.
12. The disappointment of manhood succeeds the delusion of youth. Benjamin Disraeli 
13. And wisdom usually follows illusion, delusion,(sentencedict.com/delusion.html) and disillusion.
14. And both are gripped by the same dogmatic delusion.
15. Of possession as the delusion we all run aground on.
16. Working on this delusion, they then feel either excited and act like silly children or confused and act like silly children.
17. Faith and credulity, vision and delusion can only be distinguished provided that in case-studies the issue of ontology is kept alive.
18. I thought the whole idea was just a foolish and dangerous delusion.
19. There is no fire like lust, no grip like hate; there is no net like delusion, no river like craving.
20. At the time I was still labouring under the delusion that the project might be a success.
21. Most of the people realized that their scheme was simply a snare and a delusion.
22. He seems to have retreated into a world of fear and delusion.
23. The novel fan is always daydreaming and sometimes under the delusion that he becomes Napoleon.
24. The people never give up their liberties but under some delusion. Edmund Burke
25. Organized religion is a product of a mix of superstition, delusion, divination and humanity to calm and control the human mind. Dr T.P.Chia
26. How splendid, they have a warm spot in their hearts for those suffering from messianic delusion.
27. The point is that you are suffering from a complex delusion.
28. That she kept screaming these exact words and weeping had been placed on her record as the manifestation of a childhood delusion.
29. The defendant is a cantankerous individual gripped by the dangerous delusion that his opinion matters.
30. We sat in the packed aisles, the building's relative simplicity a delusion for what was to follow.
More similar words: allusion, illusion, exclusion, preclusion, conclusion, in conclusion, disillusion, draw a conclusion, disillusionment, elusive, fusion, infusion, confusion, intrusion, delude, inclusive, exclusive, exclusively, inconclusive, delegation, delectation, illustration, pension, mansion, passion, mission, session, tension, evasion, cession.