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autism
noun
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How to pronounce autism:

Definition of autism:

autism (noun):
(psychiatry) an abnormal absorption with the self; marked by communication disorders and short attention span and inability to treat others as people.
a variable developmental disorder that appears by age three and is characterized especially by difficulties in forming and maintaining social relationships, by impairment of the ability to communicate verbally or nonverbally, and by repetitive behavior patterns and restricted interests and activities

Other 3-syllable words like autism

Here are some other common words that have 3 syllables, like autism does.

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The longest English word without repeated letters, 'uncopyrightable', has seven syllables.

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