the space between two lines or planes that intersect; the inclination of one line to another; measured in degrees or radians
cause to open or to become open
start to operate or function or cause to start operating or functioning
affording unobstructed entrance and exit; not shut or closed
affording free passage or access
with no protection or shield
begin or set in action, of meetings, speeches, recitals, etc.
open to or in view of all