to measure how much of a substance is in a liquid by adding it to measured amounts of another substance that reacts to it, for example, by making it change colour

The sample is titrated at a pH near 10 with EDTA solution until a colour change occurs.

Water samples were taken at many depths and every sample that came back was titrated on board ship.

A solution of hydrochloric acid was titrated against a standard sodium hydroxide solution.