Asbestos Definitions from Occupational Safety and Health Administration

"Asbestos" includes chrysotile, amosite, crocidolite, tremolite asbestos, anthophyllite asbestos, actinolite asbestos, and any of these minerals that have been chemically treated and/or altered.

"Asbestos-containing material (ACM)" means any material containing more than 1% asbestos.

"Assistant Secretary" means the Assistant Secretary of Labor for Occupational Safety and Health, U.S. Department of Labor, or designee.

"Authorized person" means any person authorized by the employer and required by work duties to be present in regulated areas.

"Building/facility owner" is the legal entity, including a lessee, which exercises control over management and record keeping functions relating to a building and/or facility in which activities covered by this standard take place.

"Certified Industrial Hygienist (CIH)" means one certified in the practice of industrial hygiene by the American Board of Industrial Hygiene.

"Director" means the Director of the National Institute for Occupational Safety and Health, U.S. Department of Health and Human Services, or designee.

"Employee exposure" means that exposure to airborne asbestos that would occur if the employee were not using respiratory protective equipment.

"Fiber" means a particulate form of asbestos 5 micrometers or longer,with a length-to-diameter ratio of at least 3 to 1.

"High-efficiency particulate air (HEPA) filter" means a filter capable of trapping and retaining at least 99.97 percent of 0.3 micrometer diameter mono-disperse particles.

see also:

Guidelines OSHA guidelines on Asbestos
Asbestos Employees - Do you know the OSHA guidelines for safety?

Standards OSHA standards for employees involved in asbestos abatement
Asbestos Employees - Do you know the OSHA standards for safety?

OSHA Standards for Safety Occupational Safety and Health Administration (OSHA) Asbestos Safety
Standards for asbestos from OSHA regarding occupational safety