mutualcode

noun
UK /ˈmjuːtʃuəlkəʊd/
US /ˈmjuːtʃuəlkoʊd/

A mutualcode is a special set of secret signs that two or more people agree on so they can understand each other.

The two friends made a mutualcode so only they could read their notes.


OTHER MEANINGS

2. A set of rules that two groups both promise to follow.

The clubs signed a mutualcode about sharing the park.

3. A hidden pattern that two people use to send messages to each other.

They tapped a mutualcode on the desk during class.

4. A shared way of writing that both sides understand.

The pen pals invented a mutualcode for their letters.