CHAPTER 3 DEFINITIONS
SECTION 3-1 GENERAL
3-1.1 The following terms, for the purposes of this Code, shall
have the meanings given in this chapter, if not otherwise modified
for a specific occupancy.
3-1.2 Words used in the present tense include the future; words
used in the masculine gender include the feminine and neuter; the
singular number includes the plural and the plural, the singular.
3-1.3 Where terms are not defined in this chapter, they shall have
their ordinarily accepted meanings or such as the context implies.
SECTION 3-2 DEFINITIONS
Accessible Area of Refuge. An area of refuge that complies
with the accessible route requirements of CABO/ANSI A117.1,
American National Standard for Accessible and Usable Buildings
Accessible Means of Egress. A path of travel, usable by a
person with a severe mobility impairment, that leads to a public
way or an area of refuge.
Addition. An extension or increase in floor area or height of a
building or structure.
Aisle Accessway. (See Section 8-1 or 9-1.)
Ambulatory Health Care Center. (See Section 12-1 or 13-1.)
Anchor Store. (See Section 24-1 or 25-1.)
Apartment Building. (See Section 18-1 or 19-1.)
Approved.* Acceptable to the authority having jurisdiction.
Area. (See Floor Area.)
Area of Refuge. (See 5-1.2.)
Assembly Occupancy. (See Section 4-1 and Section 8-1 or 9-
Atrium. A floor opening or series of floor openings connecting
two or more stories that is covered at the top of the series of
openings and is used for purposes other than an enclosed stairway;
elevator hoistway; escalator opening; or utility shaft used for
plumbing, electrical, air conditioning, or communication facilities.
Authority Having Jurisdiction.* The organization, office, or
individual responsible for approving equipment, an installation, or
Automatic. Providing a function without the necessity of human
Birth Center.* A facility where low risk births are planned to
occur following normal, uncomplicated pregnancy, providing professional
midwifery care to women during pregnancy, birth, and
Bleachers. A grandstand where the seats are not provided
Board and Care. (See Section 22-1 or 23-1.)
Building. Any structure used or intended for supporting or
sheltering any use or occupancy. The term building shall be construed
as if followed by the words “or portions thereof.” (See also
Building, Existing.* Any structure erected or officially authorized
prior to the effective date of the adoption of this edition of the
Code by the agency or jurisdiction.
Business Occupancy. (See Section 4-1.)
Combustible. Capable of undergoing combustion.
Combustion. A chemical process that involves oxidation sufficient
to produce light or heat.
Common Atmosphere (Educational Occupancies). (See
Section 10-1 or 11-1.)
Common Path of Travel. That portion of exit access that
must be traversed before two separate and distinct paths of travel to
two exits are available. Paths that merge are common paths of
travel. Common path of travel is measured in the same manner as
travel distance but terminates at that point where two separate and
distinct routes become available.
Complete Smoke Detection System. (See 7-6.2.7.)
Correctional Occupancy. (See Section 4-1.)
Court. An open, uncovered, unoccupied space, unobstructed
to the sky, bounded on three or more sides by exterior building
Court, Enclosed. A court bounded on all sides by the exterior
walls of a building or exterior walls and lot lines on which walls are
Covered Mall. (See Section 24-1 or 25-1.)
Critical Radiant Flux. The level of incident radiant heat energy
on a floor covering system at the most distant flameout point
as determined by the test procedure of NFPA 253, Standard
Method of Test for Critical Radiant Flux of Floor Covering
Systems Using a Radiant Heat Energy Source. The unit of measurement
of critical radiant flux is watts per square centimeter
Day-Care Home. (See Section 30-1 or 31-1.)
Day-Care Occupancy. (See Section 4-1 and Section 30-1 or
Detention Occupancy. (See Section 4-1.)
Direct Exit. (See Section 14-1 or 15-1.)
Dormitory. (See Section 16-1 or 17-1.)
Draft Stop. A continuous membrane used to subdivide a concealed
space to restrict the passage of smoke, heat, and flames.
Dwelling Unit. A single unit, providing complete, independent
living facilities for one or more persons, including permanent
provisions for living, sleeping, eating, cooking, and sanitation.
Educational Occupancy. (See Section 4-1 and Section 10-1
Evacuation Capability. (See Section 22-1 or 23-1.)
Exhibit. (See Section 8-1 or 9-1.)
Exhibitor. (See Section 8-1 or 9-1.)
Existing.* That which is already in existence on the date when
this edition of the Code goes into effect.
Exit. That portion of a means of egress that is separated from
all other spaces of the building or structure by construction or