
A biosafety level is a level of the biocontainment precautions required to isolate dangerous biological agents in an enclosed facility. The levels of containment range from the lowest biosafety level 1 (BSL-1) to the highest at level 4 (BSL-4). In the United States, the Centers for Disease Control and Prevention (CDC) have specified these levels. ...
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http://en.wikipedia.org/wiki/Biosafety_level

Biosafety level: A specific combination of work practices, safety equipment, and facilities which are designed to minimize the exposure of workers and the environment to infectious agents. The biosafety levels are: Level 1 -- This level applies to agents that do not ordinarily cause human disease. Level 2 -- This level is appropriate for agents tha...
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http://www.medterms.com/script/main/art.asp?articlekey=14880
noun the level of safety from exposure to infectious agents; depends on work practices and safety equipment and facilities
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https://www.encyclo.co.uk/local/20974
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