What does aliquot mean?
An aliquot is an exact portion of something larger: a quantity that divides the whole without leaving any remainder. In mathematics, an aliquot part is a divisor of a number other than the number itself — six, for example, is an aliquot part of eighteen. In laboratory science, the word has become indispensable to analytical chemistry and biology, where an aliquot refers to a precisely measured sample drawn from a larger volume so that analyses can be run without disturbing or depleting the original stock. Researchers routinely speak of taking aliquots when preparing specimens for testing. The word carries a precise, technical connotation and belongs firmly to scientific writing rather than casual conversation. Its usefulness lies in the exactness it implies: an aliquot is never an approximate splash but a rigorously measured fraction, which is why the term appears constantly in experimental protocols, quality-control procedures, and published research methods.
A portion of a total amount of a substance or solution, especially one measured out for analysis; also, in mathematics, a quantity that divides another an exact number of times.
"Each vial contained an aliquot of the diluted antibody solution."
The laboratory sense dominates contemporary usage.
Describing a portion that divides a whole exactly, without remainder.
"The recipe called for aliquot parts of each reagent."
Regular plural; commonly used when referring to multiple measured portions.
"The researcher prepared three separate aliquots from the original stock solution."
In music theory, 'aliquot' names the string segments on a piano that create shimmering overtones — the same math that divides your chemistry samples.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of aliquot
Aliquot comes from Latin, formed from alius ('some' or 'other') plus quot ('how many'), literally meaning 'some how many' — that is, a definite number of times a quantity is contained in a whole. It entered English in the late 16th or early 17th century through mathematical writing, initially in discussions of exact division. Its Latin relatives include aliquant ('not dividing exactly') and, more distantly through quot, words like quota and quantity.
How aliquot is actually used
Aliquot is a technical term used mainly in scientific and mathematical registers — laboratory protocols, analytical chemistry, and number theory. In everyday speech it would sound formal or pedantic. The noun sense is by far the most common in modern use, particularly in laboratory contexts where precision matters.
Easily confused with aliquot
An aliquot divides the whole exactly (with no remainder), whereas an aliquant does not divide it evenly.