easy
A fair coin has probability one half of landing heads.
What does Probability mean?
Probability measures likelihood from 0 to 1, or 0% to 100%.
Dictionary definition
A measure of how likely an event is, from 0 for impossible to 1 for certain, also expressible from 0% to 100%.
Example sentences
Probability in a sentence
medium
The experimental probability changed as more trials were completed.
hard
The probabilities of complementary events add to one.
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Quick practice
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Practice the meaning of Probability
Answer three quick questions about its meaning and related words.
Question 1 of 3
Practice 1
What is the probability of rolling an even number on a fair six-sided die?
Three of six equally likely outcomes—2, 4, and 6—are even.
Practice 2
Which is a valid probability?
Probabilities lie from 0 through 1 inclusive.
Practice 3
If P(rain) = 0.3, what is P(no rain)?
Complementary probabilities add to 1.
Practice complete
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You completed 3 questions.
Pronunciation coach
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Probability
Voice settings
Sounds like
prob · uh · bil · uh · tee · strongest beat: bil
Tap each sound part, then blend the whole word together.
Learn
WordProbability.
Partnoun.
MeaningProbability means Probability measures likelihood from 0 to 1, or 0% to 100%.
ExampleExample: A fair coin has probability one half of landing heads.
Word breakdown
5 syllables. Say each part, then blend the word.
- Syllables
- prob · uh · bil · uh · tee
- Strongest beat
- bil
- Ending
- tee
- Tip
- Put a little extra energy on bil.
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Synonyms
Words like Probability
likelihoodThe degree to which an event is expected to occur.
chanceA common word for the likelihood of an outcome.
oddsRelated but represented differently: odds compare favorable and unfavorable possibilities rather than favorable outcomes to all outcomes.
Antonym review
Does Probability have an opposite?
Probability names a likelihood measure and has no direct antonym. Certainty and impossibility are endpoint probabilities of 1 and 0, not opposites of the concept.
Synonym practice
Want to practice probability synonyms in context? Try a Synonym Search question like "The probability of rain seemed high," then compare close word choices. Practice probability synonyms.
Word family
Probability word family
Base word
probable
noun
probability
A numerical measure of likelihood.
noun
probabilities
More than one likelihood measure.
adverb
probably
With a likelihood greater than mere possibility, depending on context.
adjective
improbable
Not likely to occur.
Related words
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Student support
Understand Probability
Hint for students
For equally likely outcomes, probability = favorable outcomes ÷ total outcomes.
Common mix-up
Probability cannot be below 0 or above 1. Certainty and impossibility are probability values, not antonyms of probability.
Try it in class or at home
Run 50 trials with a coin, spinner, or die. Graph cumulative experimental probability and compare it with the theoretical value.
Teacher prompt
List the sample space for a fair die, calculate a theoretical probability, run repeated trials, and compare experimental results as trials accumulate.
Word Wheel · Grades 6+
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Learning activities
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