A-day D day H hour border line bound boundary boundary condition boundary line bourn break boundary breakoff point ceiling charged moment circumscription compass confine critical moment crucial moment cutoff cutoff point decisive moment delimitation determinant division line eleventh hour end extremity finish floor frontier hedge high-water mark interface kairos kairotic moment limen limit limitation limiting factor line line of demarcation low-water mark lower limit march mark mete moment of truth nick of time pregnant moment psychological moment start starting line starting point target date term terminal date terminus threshold time allotment upper limit zero hour