Etymology
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malfunction (n.)

"a faulty functioning, a failure to function as expected," 1827, from mal- "bad, badly, wrong" + function. As a verb, "to fail to function normally or as expected," by 1888. Related: Malfunctioned; malfunctioning.

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Definitions of malfunction
1
malfunction (v.)
fail to function or function improperly;
the coffee maker malfunctioned
Synonyms: misfunction
2
malfunction (n.)
a failure to function normally;
From wordnet.princeton.edu