Margin of Safety

span of time which allows room to maneuver or make changes

Margin of safety may mean:Margin of safety in financial context.Margin of safety in engineering contexts (factor of safety minus one).
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Noun
1. an index indicating the amount beyond the minimum necessary; "in engineering the margin of safety is the strength of the material minus the anticipated stress"
(synonym) safety margin, margin of error
(hypernym) index

With respect to working capital management, the difference between 1) the amount of long-term financing, and 2) the sum of fixed assets and the permanent component of current assets.