certain event

1. An event that contains all of the possible outcomes and thus is known a priori to be certain to occur;

2. An event that contains all of the possible outcomes and thus is known a priori to be certain to occur; (more formally) the entire sample space (which by definition has measure 1 and probability 1); said sample space with the exclusion of, at most, a set of measure 0 (thus retaining measure 1).

   The entire sample space (which by definition has measure 1 and probability 1); said sample space with the exclusion of, at most, a set of measure 0 (thus retaining measure 1).

1. The unpredictability of certain events is incredible.

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2. They were erected to commemorate a certain event or to tell an ancestral legend.

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3. They were established to celebrate a certain event or to tell an age-old legend.

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