Definition/Meaning  Word/Phrase 
(astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and 
celestial longitude
,
RA
,
right ascension

one of two points of intersection of the Earth's axis and the celestial sphere 
celestial pole
,
pole

Latin cross with a ring surrounding the intersection 
Celtic cross

intersection or crossing of two tracts in the form of the letter X 
chiasm
,
chiasma
,
decussation

point of intersection by three or more lines 
concurrence

(geometry) a curve generated by the intersection of a plane and a circular cone 
conic
,
conic section

intersection of two streets 
corner
,
street corner
,
turning point

intersection of two lines 
cross

sharp side formed by the intersection of two surfaces of an object 
edge

closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it 
ellipse
,
oval

(geology) line determined by the intersection of a geological fault and the earth's surface 
fault line

intersection of a railway and a road on the same level; barriers close road when trains pass 
grade crossing
,
level crossing

(shipbuilding) the point of intersection between two vertical lines, one line through the center of buoyancy of the hull of a ship in equilibrium and the other line through the center of buoyancy of the hull when the ship is inclined to one side; the dist 
metacenter
,
metacentre

point of intersection 
node

point of intersection of coordinate axes; where the values of the coordinates are all zero 
origin

triangle, intersection of three altitudes of 
orthocenter

plane curve formed by the intersection of a right circular cone and a plane parallel to an element of the curve 
parabola

control of traffic by a policeman stationed at an intersection 
point duty

policeman stationed at an intersection to direct traffic 
pointsman

angle formed at the intersection of the arcs of two great circles 
spherical angle
