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a

b

c

e

d

f

g

h

Points b, c, and e are

adjacent to point a.

b,c, and e are

the adjacents of a.

We pause for a neighborly definition:

Adjacents

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Neighboring points are those which have a single line between them. Lines are connected only to points. So there is no connection between the two lines CD and BF. Two points are said to be adjacent to each other if they are connected by a single line. So point A is adjacent to B,C, and E, but not D,F,G, or H. Adjacents are close to each other. They’re neighbors.