1) Adjacent 2) Adjoining 3) Alongside 4) Conterminous 5) Neighbouring 6) Next to 
• (p. pr. & vb. n.) of Border
a mostly obsolete practice of edging a flag in a different color than the field, either for decorative purposes or to prevent fraying.
Automatically locating the correct edge of an image on a scan so that marking from the edge, frame, etc is not capture.