The term 'outer limit' can be defined by the crossword solutions of VERGE (5 letters), EDGE (4 letters), BOUNDARY (8 letters), RIM (3 letters), and END (3 letters). VERGE refers to the brink or EDGE of something, while EDGE is the line where two surfaces meet. BOUNDARY is a line that marks the limits of an area, and RIM is the outer EDGE of a circular object. Finally, END is the furthest point of something. Together, these words all refer to the outer limit, which is the farthest point or BOUNDARY of something.