Titration

verb (used with or without object), titrated, titrating. Chemistry.
1.
to ascertain the quantity of a given constituent by adding a liquid reagent of known strength and measuring the volume necessary to convert the constituent to another form.
noun
1.
an operation, used in volumetric analysis, in which a measured amount of one solution is added to a known quantity of another solution until the reaction between the two is complete. If the concentration of one solution is known, that of the other can be calculated
verb
1.
(transitive) to measure the volume or concentration of (a solution) by titration

titration ti·tra·tion (tī-trā’shən)
n.
The process, operation, or method of determining the concentration of a substance in a solution to which the addition of a reagent having a known concentration is made in carefully measured amounts until a reaction of definite and known proportion is completed, as shown by a color change or by electrical measurement, and then calculating the unknown concentration.

titrate ti·trate (tī’trāt’)
v. ti·trat·ed, ti·trat·ing, ti·trates
To determine the concentration of a solution by titration or perform the operation of titration.
ti’trat’a·ble adj.
ti’tra’tor n.
titration
(tī-trā’shən)
The process or operation of determining the concentration of a substance in solution. Titration is performed by adding to a known volume of the solution a standard reagent of known concentration in carefully measured amounts until a reaction of definite and known proportion is completed (as shown by a color change or by electrical measurement) and then calculating the unknown concentration.
titration [(teye-tray-shuhn)]

In chemistry, the determination of what materials are present in a sample by adding precise amounts of known chemicals and observing the chemical reaction.

Note: The term titration is occasionally used informally to suggest extreme precision in some sort of measurement or determination.