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Wiktionary

mutism

n. A psychological disorder in which the sufferer cannot speak in certain situations.

The Collaborative International Dictionary

Mutism

Mutism \Mut"ism\, n. The condition, state, or habit of being mute, or without speech.
--Max M["u]ller.

Douglas Harper's Etymology Dictionary

mutism

"state of being mute," 1824, from French mutisme (1741), from Latin mutus (see mute (adj.)).

WordNet

mutism

n. the condition of being unable or unwilling to speak

Wikipedia

Usage examples of "mutism".

Predictors, akinetic mutism was very rare, a result of damage to the anterior cin-gulate region of the brain.

The fact that some individuals descend into akinetic mutism whereas others do not just highlights the importance of making a choice.