Adjacency

Adjacent is an adjective meaning contiguous, adjoining or abutting. It and its noun form adjacency have several different technical meanings in mathematics:
*, said of two vertices that are the endpoints of an edge in a graph
*Adjacent angles, two angles that shares a common ray
*, the side (or cathetus) of a right triangle that touches a given non-right angle. Similarly the adjacent angle of a given side in a right triangle is the non-right angle that touches the side.
*, a side that shares an angle with another given side
*Adjacency matrix, a matrix that represents a graph
;Other uses:
* Adjacent channel in broadcasting, a channel that is next to another channel
 
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