(Accuracy -25, +75 Percent) This is an approximate estimate made without detailed data, that is usually produced from cost capacity curves, scale up or down factors that are appropriately escalated and approximate cost capacity ratios. This type of estimate is used during the formative stages of an expenditure program for initial evaluation of the project. Other terms commonly used to identify an Order of Magnitude estimate are preliminary, conceptual, factored, quickie, feasibility and SWAG.
(Wideman Comparative Glossary of Common Project Management Terms v2.1 )

J. Jerrald Hayes
I am ex-architectural woodworker and general contractor turned IT, Business and Project Management consultant, software developer wannabe senior division triathlete and ski racer, Yankee fan and founder of Paradigm-360.com, 360 Difference Mac4Construction.com,iOS4Construction.com and now TheBuildingAndRemodelingWiki.com too.
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