What does likelihood mean?
Likelihood is a noun meaning the probability or chance that something will happen, be true, or have a particular outcome. It is commonly used in discussions of risk, medicine, law, business, statistics, and everyday uncertainty. A phrase such as “the likelihood of success” refers to how probable success is, while “a greater likelihood” indicates that a chance has increased. The word is often more general than “probability”: likelihood can simply describe a possibility or degree of likelihood, whereas probability is frequently used when a precise mathematical value is intended. It is also less absolute than “certainty,” which implies that an outcome is assured. Although “likelihood” and “likeliness” overlap in meaning, “likelihood” is the more common modern form in both formal and informal usage.
nounThe probability or chance that something will happen or be true. It can also refer to the possibility of a situation or outcome.
- The probability or chance that something will happen or be true.
- A possibility that a particular event, outcome, or condition exists.
- The degree to which something is likely or probable.
"There is a strong likelihood that the weather will improve by tomorrow."
"The doctor discussed the likelihood of a full recovery before the operation."
"There is little likelihood that the proposal will be approved without substantial revisions."
Plural forms are used when referring to the chances or possibilities associated with different outcomes, people, or situations.
"The researchers compared the likelihoods of success for several treatment methods."
A likelihood is a chance in the abstract; a probability turns that chance into a number.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does likelihood come from?
The word developed in Middle English as “likeliness,” formed from “likely” and the suffix “-ness.” “Likely” itself comes from “like” in its older sense of “having the appearance of being” or “being probable,” and ultimately relates to a Germanic root meaning “similar.” The family therefore includes “likely,” “likeness,” and “likeliness,” all connected through the older idea of resemblance or appearance.
Related word forms
How likelihood is actually used
Neutral in register. It is often used in formal, analytical, or professional contexts, especially when discussing risks, outcomes, or chances.
Easily confused with likelihood
A likelihood is a general chance or possibility, while a probability is often a more precise numerical or formal measure of how likely an event is.