demarcation, terminus ad quem, limitation, restrict, confine, circumscribe, boundary, restrain, demarcation line, limit point, more...

unlimited, boundless, infinite, unrestricted, limitless

one-sided, two-sided, infinite, removable, nonremovable, jump, essential, pointwise, more...

upper, lower, elastic, certain, maximum, northern, extreme, southern, practical, mile, legal

maximum potential,   set boundaries,   restrict or confine,   bounds or limits,   maximum capacity,   floor or ceiling,   maximum amount,   to narrow down,   end of tether,   ceiling or cap,   to restrict freedom