probability measure
nounA probability measure is a math rule that gives every possible thing that can happen a number from zero to one, showing how likely it is.
The teacher used a probability measure to show that rolling a six on a fair die has a chance of one in six.
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2. In advanced math, a function that assigns a number between 0 and 1 to each event in a sample space and adds up to 1 over all possible outcomes.
The probability measure on the coin-toss space gives heads and tails each a value of one half.
3. A way of measuring how likely something is, used in science and statistics to compare different outcomes.
Researchers applied a probability measure to estimate the risk of rain tomorrow.
4. A formal tool in measure theory for describing random experiments.
The probability measure must satisfy the rule that the chance of all possible outcomes together equals one.