Intersection & permeability

in·ter·sec·tion (ntr-skshn)

n.

1. The act, process, or result of intersecting.

2. also (ntr-sk-) A place where things intersect, especially a place where two or more roads cross.

3. Mathematics

a. The point or locus of points where one line, surface, or solid crosses another.

b. A set that contains elements shared by two or more given sets.

permeability [ˌpɜːmɪəˈbɪlɪtɪ]

n

1. the state or quality of being permeable

2. (Physics / General Physics) a measure of the response of a medium to a magnetic field, expressed as the ratio of the magnetic flux density in the medium to the field strength; measured in henries per metre. Symbol μ

3. (Engineering / Civil Engineering) Civil engineering the rate of diffusion of a fluid under pressure through soil

4. (Engineering / Aeronautics) the rate at which gas diffuses through the surface of a balloon or airship, usually expressed in litres per square metre per day