A supposed material or psychical agent or mode of activity other than a force, law, or purpose; fortune; fate; -- in this sense often personified.

The supposed effect of such an agent; something that befalls, as the result of unknown or unconsidered forces; the issue of uncertain conditions; an event not calculated upon; an unexpected occurrence; a happening; accident; fortuity; casualty.

To happen, come, or arrive, without design or expectation.

To befall; to happen to.

Happening by chance; casual.

A situation in which something happens unpredictably without discernable human intention or observable cause.

(4) The possibility of an outcome in an uncertain event. Example: In tossing a coin there is an equal chance of getting heads or tails.

an unknown and unpredictable phenomenon that causes an event to result one way rather than another; "bad luck caused his downfall"; "we ran into each other by pure chance"

come upon, as if by accident; meet with; "We find this idea in Plato"; "I happened upon the most wonderful bakery not very far from here"; "She chanced upon an interesting book in the bookstore the other day"

occurring or appearing or singled out by chance; "their accidental meeting led to a renewal of their friendship"; "seek help from casual passers-by"; "a casual meeting"; "a chance occurrence"

an event, which might be rare and uncertain but is significant for decision making in the dynamic environment

Events that occur without cause or reason. See Bahnsen, 728.

Random or unpredictable influences on events or an unexplained variable within a clinical experiment.

An event that occurs without an identifiable cause or human intervention; occurs unpredictably; the cause of unaccountable happenings.

The constellation of undefined causal factors which are considered to be irrelevant to the causal relationship under investigation; often spoken of as if it were a single, independent agency; the expression “pure chance” is sometimes used to describe a state characterized by complete unpredictability, that is, an absence of any cause-effect relationships. The term “chance” is frequently a short-hand expression for “mean chance expectation” as in “deviation from chance.

Being undetermined. Events without apparent cause. An accidental happening.

An uncaused event. Current theories like the Big Bang imply that all happened by chance. However, chance is unobserved and not measurable - it simply does not exist except as a mental construct.