ETYM French apparition, Latin apparitio, from apparere. Related to Appear.
1. An unexpected appearance or becoming visible.
2. An unusual appearing ghostly figure; SYN. phantom, specter, spectre.
3. Something existing in perception only; SYN. phantom, shadow.

ETYM Latin chimaera a chimera, Greek chimera, chimera, he-goat; cf. Icel. qymbr a yearling ewe.
In biology, an organism composed of tissues that are genetically different. Chimeras can develop naturally if a mutation occurs in a cell of a developing embryo, but are more commonly produced artificially by implanting cells from one organism into the embryo of another.
A grotesque product of the imagination; SYN. chimaera. + prikaži više

ETYM French déception, Latin deceptio, from decipere, deceptum. Related to Deceive.
The act of deceiving; SYN. deceit, dissembling, dissimulation.
In warfare, the use of dummies, decoys, and electronics to trick the enemy into believing in and preparing to defend against armies that do not exist.
The Allied ground offensive in the 1991 Gulf War was launched 160 km/100 mi W of where the Iraqi army was led to believe it would take place. The deception techniques used completely wrong-footed the Iraqi forces. + prikaži više

ETYM Latin delusio, from deludere. Related to Delude.
In psychiatry, a false belief that is unshakeably held. Delusions are a prominent feature of schizophrenia and paranoia, but may also occur in other psychiatric states.
1. A mistaken opinion or idea.
2. An erroneous belief that is held in the face of evidence to the contrary; SYN. psychotic belief. + prikaži više

ETYM Latin hallucinatio: cf. French hallucination.
Perception of something that does not exist. It may be visual but may also arise from any of the other senses. Unlike an illusion, a hallucination has no basis in reality. It may occur in psychosis, in organic brain disease (especially temporal lobe epilepsy) or be due to drugs.
Illusory perception. + prikaži više

ETYM French illusion, Latin illusio, from illudere, illusum, to illude. Related to Illude.
Generally, a delusion, deception, or false perception. Illusion is, like appearance, usually contrasted with reality. The concept is often used in the philosophy of perception and in epistemology. It is only by trusting some experiences that we can identify others as illusory, so the occurrence of illusions does not mean that everything is illusory.
1. An erroneous mental representation; SYN. semblance.
2. Deception by creating illusory ideas; SYN. head game.
3. Something many people believe that is false; SYN. fantasy, phantasy, fancy. + prikaži više