What does sufficiency mean?
Sufficiency means being enough, whether in quantity, quality, or ability to meet a particular need. It is used especially in formal and academic contexts when discussing evidence, resources, explanations, time, or capacity. For example, a judge may question the sufficiency of evidence, while a planner may assess whether a budget has sufficient resources to achieve its goals. The word can describe the condition of adequacy itself or the amount available, and it often carries the implication that a standard has been met, though not necessarily that it has been exceeded. Compared with “plenty,” sufficiency is more restrained and evaluative; compared with “enough,” it is more formal. It is related to the verb “suffice” and the adjective “sufficient,” and its opposite is “insufficiency” or “inadequacy.”
nounThe quality or state of being sufficient; an amount or condition that is enough to meet a need or requirement. It can also refer to the quality of being adequate for a particular purpose.
- The quality or state of being sufficient.
- An amount that is enough to meet a need or requirement.
"The committee questioned whether the evidence was sufficient to justify the proposed policy."
"The available resources were of insufficient sufficiency to complete the project."
"She doubted the sufficiency of the evidence for such a sweeping conclusion."
Plural is used when referring to separate instances or cases of adequacy, especially across different areas or situations.
"The evaluators compared the sufficiencies of the different response plans."
Sufficiency is the noun for the moment when “enough” is not just an idea but a condition that has been met.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does sufficiency come from?
Sufficiency comes through Middle English from Old French suffisance, meaning adequacy or enough, which was derived from the Latin sufficientia. The Latin word was based on sufficere, “to be enough” or “to suffice,” a compound of suf- and facere, “to make,” reflecting the idea of making something sufficient. Related English forms include “suffice,” “sufficient,” and “sufficiently,” while “insufficient” expresses the opposite condition.
Related word forms
How sufficiency is actually used
The word is formal and somewhat literary. In everyday speech, “enough,” “adequacy,” or “sufficiency” are often more natural, depending on context.
Easily confused with sufficiency
Sufficiency describes whether something is enough, while sufficiency is the condition or quality of being enough.
Sufficiency concerns adequacy, whereas efficiency concerns achieving a result with minimal wasted effort or resources.