(physics) The range of electron energies in an insulator or semiconductor in which electrons can move freely and transport charge.

Any metal wire used to carry electricity over a short or long distance.

A document that grants safe passage through enemy territory in times of war. / A convoy or guard to protect a person in a foreign country.

(obsolete) To guarantee safe passage by granting such a document.

The security given by authority of a government to a stranger for his quietly coming into and passing out of the territories over which said government has jurisdiction or control.

Subsequent behavior.

A psychological disorder of childhood or adolescence, characterized by persistent antisocial behaviours.

(geology) A material property (e.g., for rocks or soil) that describes the rate which water can flow through pore spaces or fractures. SI units: m/s. Symbol: K.

(physics) A measure of the ability of a material to conduct heat, often denoted k, λ, or κ.

thermal conductivity