Longman Dictionary of Contemporary English homepage

decipher

verb
     
de‧ci‧pher [transitive]
1 to find the meaning of something that is difficult to read or understand [↪ indecipherable]:
She studied the envelope, trying to decipher the handwriting.
2 to change a message written in a code into ordinary language so that you can read it [= decode]
decipherment noun [uncountable]

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