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Missouri Scholars Academy. A three week social and educational session at Mizzou for 330 juniors every July. Commonly noted as "the best three weeks of your life." MSA Alumni signal each other with the call and response of "BOOMBA!" and "HEY!"

Many people who can't get in to MSA call it summer school or nerd camp, but they don't know what they're missing.
Man, MSA was so much better than the real life. Go nerd camp!
msa by Josh/Tex July 14, 2006
Related Words
msa Msacras MSAian MSAP msa3ed Msaa msac msace Msad msadoreher
manatee school for the arts, probably one of the lamest schools in florida. mainly a bunch of stuck up wannabes & dickheads.
teacher: did u c her dance?
student: yea she looked like a dying hippo, is she from msa?
teacher: ....
msa by idk543 February 23, 2011
Modern Standard Arabic; the dialect of Arabic used in almost all writing and in formal spoken contexts
The regional dialects are different from MSA.
MSA by Carmen September 27, 2005
Maryland School Assesment for grades 3-8

For Reading and Math
I took the Math MSA today and im gonna take the Reading MSA tomorrow
MSA by MSA333 March 25, 2009
Metropolitan Statistical Area

In the USA this refers to an urban cluster (continuously built up area,) or clusters of 50K people of more each, the county it (or they) sit in, as well as the counties (or townships in New England) where significant numbers of people commute to and from that county. It includes urban (high density,) suburban (lower density,) and exurban (rural nonfarm) areas, as well as farmland.
Metropolitan Statistical Area (MSA)

Definition: Geographical divisions, determined by the United States Office of Management and Budget, for the purposes of census data and other urban population calculations. The divisions are primarily based on urban areas, and tend to follow town or county borders. The MSAs can also be broken down into smaller “Metropolitan Divisions.” Previously called Standard Metropolitan Statistical Area (SMSA).

-BusinessDictionary.com
MSA by Miskatonic Jack 2 November 17, 2010
Most Stupid Answer.
Commonly said to reproach the use of a typical statement.
A: Haha, we won. Take that!

B: Noob team

A: /msa on
A: Yeah, noob team -.-'
A: /msa off
msa by -SaLeM- December 30, 2010