• WordNet 3.6
    • n nonperformance failure to act with the prudence that a reasonable person would exercise under the same circumstances
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Webster's Revised Unabridged Dictionary
    • n Nonperformance Neglect or failure to perform.
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Century Dictionary and Cyclopedia
    • n nonperformance A failure or neglect to perform.
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In literature:

The nonperformance may be treated as a breach of warranty.
"Putnam's Handy Law Book for the Layman" by Albert Sidney Bolles

In news:

Revisiting Tilda Swinton's legendary "nonperformance.".