This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of delusion.

"One of the great challenges in examining a case like this is to be able to distinguish whether it is the organized behavior that drives from a fixed false idea, an irrational, what we call delusions in which people who have a major illness can actually behave in an organized way or if there is something in parallel, some particular resentment."

allusions    conclusions    confusions    contusions    exclusions