Tacit – Understood or implied without being stated
That hat with the tassels on it (tacit) meant that she had graduated. It didn't need to be stated it was just understood.
Examples of tacit in a sentence
We had tacit consent from the police for the party in the field but that didn't stand up in court.
I nodded in tacit understanding as the teacher went through the theory of evolution.
They had not signed a treaty but there was a tacit understanding between the countries that they would get along.