The Oxford Thesaurus An A-Z Dictionary of Synonyms - marginn.

1) edge, border, perimeter, periphery; rim, lip, side, brink, verge: Leave a one-inch margin at the left side of the page. Trees grew at the margin of the pond. 2) limit(s) , bound(s) , boundary (line) , border, frontier, line, partition line: These streets form the margin of the inner city. 3) allowance, play, leeway, latitude, scope, freedom, room, space; compass: These calculations do not provide much of a margin for error.