chance

nouns

a possibility due to a favorable combination of circumstances
"the holiday gave us the opportunity to visit Washington"; "now is your chance"
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"
a risk involving danger
"you take a chance when you let her drive"
is derived from
is a type of (narrower)
a venture undertaken without regard to possible loss or injury
"he saw the rewards but not the risks of crime"; "there was a danger he would do the wrong thing"
a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible
"the probability that an unbiased coin will fall with the head up is 0.5"
the possibility of future success
"his prospects as a writer are excellent"

verbs

be the case by chance
"I chanced to meet my old friend in the street"
is a type of (narrower)
come to pass
"What is happening?"; "The meeting took place off without an incidence"; "Nothing occurred that seemed important"
take a risk in the hope of a favorable outcome
"When you buy these stocks you are gambling"
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"

adjectives

occurring or appearing or singled out by chance
"seek help from casual passers-by"; "a casual meeting"; "a chance occurrence"