human action, human activity, act - something that people do or cause to happen

failure - an act that fails; "his failure to pass the test"

error, mistake, fault - a wrong action attributable to bad judgment or ignorance or inattention; "he made a bad mistake"; "she was quick to point out my errors"; "I could understand his English in spite of his grammatical faults"

negligence, nonperformance, carelessness, neglect - failure to act with the prudence that a reasonable person would exercise under the same circumstances