What does inexact mean?
The adjective inexact describes something that is approximately true, but not exact or perfectly accurate. It can apply to measurements, estimates, calculations, descriptions, terminology, and methods. Inexactness is often acceptable when precision is unimportant, but it can matter in scientific research, engineering, law, finance, and other contexts where small differences may affect the result. The word is not necessarily a synonym for incorrect: an estimate may be broadly reasonable while still being imprecise. Compared with inaccurate, which often suggests that something is actually wrong, inexact focuses more on the absence of precision. It is also useful in discussion of language and definition, where a term may convey the general idea without capturing every relevant detail. As a formal but widely understood adjective, inexact clarifies exactly how far a statement or result departs from complete accuracy.
adjectiveNot exact; approximate or not precisely accurate. An inexact result, measurement, or description may be close to the truth but lacks complete precision.
- Not exact; approximate or not precisely accurate.
"The map provided only an inexact estimate of the route."
"The instrument is known for its inexact measurements."
"Her description of the event was colorful but inexact."
An inexact answer may be useful, but it leaves room for a crucial gap between approximately right and exactly right.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does inexact come from?
The word inexact was formed in English by adding the negative prefix in- to exact. Exact comes through Middle English from Latin exactus, a past participle of exigere, meaning to drive out, complete, or make exact. The same Latin root is reflected in related English forms such as exactly, exactness, and exacting, while cognates exist in other European languages. The prefix in- in this formation has a negative meaning and is distinct in pronunciation and historical development from the prefix in- meaning “in” or “into.”
Related word forms
How inexact is actually used
The adjective is formal and neutral. It is common in technical, scientific, and academic contexts, especially when discussing measurements, calculations, estimates, definitions, and descriptions.
Easily confused with inexact
Inexact emphasizes imprecision or approximation, while inaccurate suggests a result or statement that is wrong rather than merely lacking exactness.