Plimsoll line Plimsoll mark border line bound boundary boundary condition boundary line bourn break boundary breakoff point ceiling circumscription compass confine cutoff cutoff point deadline delimitation determinant division line end extremity finish floor frontier hedge interface limen limit limitation limiting factor line line of demarcation load waterline low-water mark lower limit march mark mete start starting line starting point target date term terminal date terminus threshold tidemark time allotment upper limit waterline watermark