Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 adjective Having equal mathematical or logical probability.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 adjective mathematics, logic Having
equal probability
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 adjective equally probable
Etymologies
Sorry, no etymologies found.
Examples

It can then be argued that the competing stories should initially be viewed as equiprobable, and that, in turn, will enable one to place an upper bound on the probability of the relevant story advanced by van Inwagen.

If all states of the world are equiprobable, this is a partial pooling equilibrium.

Most often one makes the most pessimistic assumption that all the possible states of the device are equiprobable.
The Silliest Thing Yet, or Sheer Genius?  The Panda's Thumb

'God's existence and nonexistence are exactly equiprobable.'

Nevertheless, it is a common error, which we shall meet again, to leap from the premise that the question of God's existence is in principle unanswerable to the conclusion that his existence and his nonexistence are equiprobable.

NOTE: a 1 character string with 32 possible equiprobable symbols (like{0,1,2…31}) has the same channel capacity as 5 coin string with 2 alphabetic symbols (like {0,1}), the math works out the same.

Given an alphabet of N equiprobable symbols, we can now use equation [1]:

Once the coin has been tossed, the system produces an amount of information that is a function of the possible outputs, in this case 2 equiprobable symbols, and equal to the data deficit that it removes.

We should acknowledge that we are never going to have the complete mutationbymutation account of the evolution of any structure, and admit that, therefore, every alternative is equiprobable.
Daniel Dennett: Intelligent design? Show me the science  The Panda's Thumb

Entropy is maximised when all 4 ok, ignoring the 5th for now bases are equiprobable, and Kolgomorov complexity when the string is random.
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