noun
: a point marking the completion of a process or stage of a process : a final point : resultant: as
a. : a point in a titration at which a definite effect is observed (as the change of color of an indicator in the neutralization of an acid by a base)
b.
(1) : the highest temperature observed in a distillation especially in the analysis of various petroleum products (as gasoline)
(2) : the temperature at which liquid ceases to distill over
c. : the greatest dilution (as of a virus or a vitamin) that will produce a specified effect in a biological system (as the production of a disease or the alleviation of an avitaminosis) and that is usually determined in bioassay as the 50 percent end point at which the specified effect appears in one half of the test subjects