Having equal probability or likelihood; equally likely to happen.
From Latin 'equi-' (equal) + 'probabilis' (probable, from 'probare' meaning to test or approve). The word entered English scientific terminology in the 1600s.
When you shuffle a deck of cards properly, every card is equally likely to be on top—that's equiprobable! But humans are terrible at shuffling randomly, which is why magicians can predict what you'll 'randomly' pick.
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