WordReference Random House Unabridged Dictionary of American English © 2026
opera′tions research′, 
  1. Mathematicsthe analysis, usually involving mathematical treatment, of a process, problem, or operation to determine its purpose and effectiveness and to gain maximum efficiency.
  • 1940–45, American.

Collins Concise English Dictionary © HarperCollins Publishers::
operations research
  1. the analysis of problems in business and industry involving the construction of models and the application of linear programming, critical path analysis, and other quantitative techniques
    Also: operational research
'operations research' also found in these entries (note: many are not synonyms or translations):
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