secret ballot

noun
1.
a vote in which the confidentiality of how one votes is safeguarded.

Origin:
1910–15

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The public reaction to the scandal helped to change electoral history and
  establish the secret ballot.
Then jurors vote for the best varieties by secret ballot and are instructed to
  give disease-resistance high priority.
It was reasonably simple to implement a secret ballot.
Both approaches could do a good job of protecting privacy and preserving the
  secret ballot.
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